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695 Curated Videos · Brain-Score 75+/100

Brain, Medicine & Learning / Gehirn, Medizin & Lernen

Curated neuroscience, anatomy, physiology, immunology, sleep biology, cognitive psychology, and evidence-based learning videos with 3-point Blueprints.

Educational & Non-Medical Disclaimer: Videos and AI-generated Blueprints in Brain, Medicine & Learning are curated strictly for general scientific education and never replace professional medical advice, diagnosis, or treatment.
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Brain-Score 96/100 Osmosis from Elsevier · 10:24

Neuron action potential - physiology

  1. Dendrites convert neurotransmitter signals into EPSPs or IPSPs; reaching -55 mV at the axon hillock opens voltage-gated Na+ channels.
  2. Rapid Na+ influx depolarizes the membrane, while K+ efflux and the 3-Na+-out/2-K+-in pump restore potential during refractory phases.
  3. Along myelinated axons, electrical charge jumps node to node via saltatory conduction at speeds up to 100 meters per second.
Action PotentialEPSP & IPSP SummationSodium-Potassium PumpSaltatory Conduction
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Brain-Score 96/100 Artem Kirsanov · 21:56

The Hidden Dimensions Behind Every Move You Make

  1. Before a limb moves, motor-cortex populations encode reach target, distance, and speed across variable delays without muscle twitches.
  2. Because muscles sum fixed positive and negative neural weights, firing patterns that cancel out to zero form a silent output-null space.
  3. Preparation parks neural activity in this null space until the go cue, when recurrent dynamics sweep it into output-potent dimensions.
Output-Null Neural SubspaceMotor Cortex State-Space GeometryOutput-Potent DimensionsRecurrent Network DynamicsPreparatory Population Coding
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Brain-Score 96/100 Alila Medical Media · 7:34

Cardiac Action Potential, Animation.

  1. Spontaneous SA node pacemaker impulses spread through cardiac myocytes via gap junctions, coupling the heart to contract in synchrony.
  2. Contractile cells rest at -90 mV, fire fast Na+ channels at -70 mV, and sustain a plateau via slow L-type Ca2+ channels at -40 mV.
  3. The plateau and 250 ms absolute refractory period ensure chamber relaxation before re-excitation, preventing fatal cardiac tetanus.
SA Node AutomaticityGap Junction CouplingL-Type Ca2+ Plateau250 ms Refractory PeriodNa+/K+ Ion Pumps
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Brain-Score 95/100 TEDx Talks · 15:10

How to study to maximize performance | Elizabeth Bjork & Robert Bjork | TEDxManhattanBeach

  1. Ease and fluency during practice measure short-term performance, which often misleads learners about durable long-term retention.
  2. Children practicing beanbag throws at 3 and 5 feet beat those practicing only at 4 feet when later tested at the 4-foot target.
  3. Introduce desirable difficulties by varying conditions, spacing sessions, actively retrieving, and interleaving instead of blocking.
Learning vs PerformanceDesirable DifficultiesVaried PracticeInterleaving vs BlockingActive Retrieval & Spacing
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Brain-Score 95/100 Osmosis from Elsevier · 10:08

Anatomy and physiology of the respiratory system

  1. Diaphragm and chest muscle contraction pulls air into mucus-lined nasal cavities and four sinuses that warm, moisten, and filter it.
  2. Air passes the larynx and trachea, splitting at the carina into asymmetric bronchi and bronchioles maintained by protective club cells.
  3. Across roughly 500 million pneumocyte-lined alveoli, inhaled oxygen diffuses into capillaries while carbon dioxide diffuses out.
Diaphragmatic BreathingBronchial Tree & CarinaClub Cell RegenerationAlveolar Gas Exchange
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Brain-Score 95/100 MedCram - Medical Lectures Explained CLEARLY · 13:12

VQ Mismatch - Ventilation Perfusion Mismatch & Ratio (Remastered)

  1. V/Q ratio compares alveolar ventilation (V) to capillary perfusion (Q), spanning from infinite dead space (Q=0) to shunt (V=0).
  2. Mixing high-V/Q and low-V/Q lung units causes hypoxemia because blood oxygen saturation is weighted toward high-perfusion low-V/Q zones.
  3. V/Q mismatch elevates the A-a oxygen gradient, responds to 100% O₂ (unlike pure shunt), and underlies COPD, asthma, PE, and pneumonia.
Ventilation-Perfusion (V/Q) RatioAlveolar Dead Space vs. ShuntFlow-Weighted Venous AdmixtureAlveolar-Arterial (A-a) O₂ Gradient100% Oxygen Response Test
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Brain-Score 95/100 Alila Medical Media · 3:59

Correlation between Cardiac Action Potential and ECG, Animation

  1. Cardiac action potentials travel from the SA node through the AV node and Purkinje fibers via transmembrane ion fluxes.
  2. Contractile myocytes sustain an ion-balanced plateau phase during contraction between depolarization and repolarization.
  3. Surface ECG maps cellular events: P wave shows atrial depolarization, QRS ventricular depolarization, ST plateau, and T repolarization.
Cardiac Action PotentialSA-AV-Purkinje ConductionMyocyte Plateau PhaseQRS Complex MappingECG Wave Interpretation
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Brain-Score 95/100 Ninja Nerd · 24:23

Endocrinology | Synthesis of Thyroid Hormone

  1. Thyroid follicular cells secrete tyrosine-rich thyroglobulin into colloid and import iodide via the sodium-iodide symporter.
  2. Thyroid peroxidase oxidizes iodide to iodinate tyrosine into MIT and DIT, coupling MIT+DIT into T3 and two DITs into T4.
  3. Follicular cells endocytose colloid, cleave free T3 and T4 via lysosomal enzymes, and secrete them bound to plasma TBG.
Sodium-Iodide Symporter (NIS)Thyroid Peroxidase (TPO)ThyroglobulinMIT & DIT CouplingT3 & T4 Hormones
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Brain-Score 95/100 Osmosis from Elsevier · 6:23

Bone remodeling and repair

  1. Osteoclasts dissolve old hydroxyapatite using hydrochloric acid to release calcium and phosphate ions before apoptosis.
  2. Osteoblasts regulate resorption via RANKL and osteoprotegerin, then secrete collagen osteoid seams that mineralize into bone.
  3. Mechanical loading accelerates bone remodeling under Wolff's law, while calcitonin and vitamin D govern calcium balance.
Osteoclasts & OsteoblastsRANKL / OsteoprotegerinHydroxyapatite ResorptionWolff's LawCalcitonin Regulation
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Brain-Score 95/100 Alila Medical Media · 4:04

The Cardiac Cycle, Animation

  1. SA node firing (ECG P-wave) triggers atrial contraction to finish ventricular filling before pressure reversal closes AV valves (S1).
  2. During the QRS complex, ventricles contract isovolumetrically until chamber pressure opens semilunar valves for rapid blood ejection.
  3. Ventricular repolarization (T-wave) drops pressure, closing semilunar valves (S2) for isovolumetric relaxation and passive refilling.
Systole & Diastole MechanicsWiggers Diagram & ECG (P-QRS-T)Isovolumetric Contraction/RelaxationAV & Semilunar Pressure GradientsHeart Sounds (S1 & S2)
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Brain-Score 95/100 Laura Slusser · 3:48

Voltage-Gated Sodium Channels in Neurons

  1. Reaching threshold from -70 mV repels positive voltage sensors upward, opening gates so Na+ ions rapidly depolarize axons.
  2. Around +30 mV, an inactivation gate plugs the channel, causing the absolute refractory period until K+ efflux lowers voltage.
  3. Temporary upstream channel inactivation blocks backward depolarization, forcing action potentials to travel in one direction.
Voltage-Gated Na+ ChannelAction PotentialInactivation GateAbsolute Refractory PeriodUnidirectional Propagation
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Brain-Score 95/100 Alila Medical Media · 3:18

Gate Control Theory of Pain, Animation

  1. Nociceptors carry fast sharp pain via A-delta fibers and slow dull pain via C-fibers while inhibiting dorsal horn interneurons.
  2. Touch, heat or cold packs, and TENS currents activate large A-beta fibers that re-excite inhibitory interneurons to close the gate.
  3. Brain-released endorphins also dampen spinal pain signals by blocking Substance P release and postsynaptic action potentials.
Gate Control TheoryA-Delta, C & A-Beta FibersDorsal Horn InterneuronsTENS Nerve StimulationEndorphins & Substance P
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Brain-Score 95/100 Ninja Nerd · 31:34

Musculoskeletal System | Neuromuscular Junction | Neuromuscular Transmission: Part 1

  1. When an action potential depolarizes the motor neuron axolemma to +30 mV, voltage-gated calcium channels open at the synaptic bulb.
  2. Calcium influx links vesicle V-SNAREs—synaptotagmin and synaptobrevin—with membrane T-SNAREs to release acetylcholine.
  3. Potassium efflux repolarizes the terminal membrane to -70 mV, closing calcium channels to stop acetylcholine exocytosis.
Neuromuscular JunctionVoltage-Gated Calcium ChannelsV-SNARE & T-SNARE ProteinsSynaptotagmin & SynaptobrevinAcetylcholine Release
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Brain-Score 95/100 Alila Medical Media · 3:21

Cardiac Conduction System and Understanding ECG, Animation.

  1. The SA node initiates atrial depolarization (P wave), while the AV node delays impulses (PQ segment) so ventricles fill.
  2. Signals travel down the Bundle of His, bundle branches, and Purkinje fibers to depolarize ventricles (QRS complex).
  3. The ST segment reflects the contraction plateau, and the T wave marks ventricular repolarization before relaxation.
SA & AV NodesBundle of HisPurkinje FibersECG Waveform MappingQRS Complex
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Brain-Score 95/100 TED · 23:40

3 clues to understanding your brain | VS Ramachandran

  1. Severing pathways between visual cortex and emotional centers flattens skin conductance to a mother's face, causing impostor delusions.
  2. A simple mirror box gives visual feedback of movement, helping amputees unlearn phantom paralysis and end chronic phantom pain.
  3. The human angular gyrus sits at the crossroads of vision, touch, and hearing, enabling cross-sensory abstraction and metaphor.
Visual-Limbic DisconnectionGalvanic Skin ResponseMirror Box TherapyLearned Phantom ParalysisAngular Gyrus Abstraction
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Brain-Score 95/100 LastingLearning.com · 3:57

Using Desirable Difficulties to Enhance Learning, Dr. Robert Bjork

  1. Spacing, interleaving, varied conditions, and intermittent feedback slow initial practice yet strengthen long-term retention and transfer.
  2. Via the generation effect, learners retain answers far better when they actively produce them from cues rather than being told.
  3. A difficulty is only desirable at the learner's challenge point; without enough background knowledge to succeed, it hinders learning.
Desirable difficultiesSpaced & interleaved practiceGeneration effectIntermittent feedbackChallenge point framework
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Brain-Score 95/100 Brains Explained · 9:57

The Thalamus

  1. Thalamic nuclei relay subcortical and cortico-cortical signals via glutamatergic drivers (~10% of synapses) tuned by ~90% modulators.
  2. The surrounding thalamic reticular nucleus (TRN) and 25% local interneurons inhibit relay cells without projecting to the cortex.
  3. Special calcium channels switch relay neurons between burst mode for stimulus detection and tonic mode via high-frequency facilitation.
Thalamic Reticular NucleusDrivers vs. ModulatorsBurst vs. Tonic FiringSynaptic FacilitationSynaptic Depression
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Brain-Score 95/100 Alila Medical Media · 4:15

Portal Venous Systems, Hepatic Portal System and Liver Functions, Animation

  1. Portal venous systems connect two capillary beds via veins, routing substances directly between organs before the heart.
  2. The hepatic portal vein sends GI blood to the liver first to buffer glucose as glycogen and convert excess amino acids to urea.
  3. Hepatic first-pass metabolism can inactivate oral drugs before systemic circulation or convert oral prodrugs into active forms.
Portal Venous SystemHepatic Portal VeinHypophyseal Portal SystemGlycogen HomeostasisFirst-Pass Metabolism
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Brain-Score 95/100 Harvard Extension School · 13:11

Action Potential in the Neuron

  1. Reaching threshold voltage opens voltage-gated Na+ channels, driving sodium influx that depolarizes the neuron to +30 mV.
  2. Sodium inactivation gates shut at peak voltage while slower K+ channels open so potassium efflux repolarizes the cell.
  3. Myelin sheaths from Schwann cells or oligodendrocytes accelerate signals via saltatory conduction at nodes of Ranvier.
Action PotentialVoltage-Gated Ion ChannelsDepolarization & RepolarizationSaltatory ConductionNodes of Ranvier
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Brain-Score 94/100 Artem Kirsanov · 12:06

The Modular Architecture of Intelligence

  1. Neural compositionality lets brains learn novel tasks rapidly by recombining reusable sensory and motor modules.
  2. Prefrontal cortex recordings reveal stable neural subspaces for color detection and eye movement shared across tasks.
  3. Task-context signals dynamically route neural trajectories from sensory subspaces into the needed motor output axis.
Neural CompositionalityPrefrontal Cortex (PFC)Neural Activity SubspacesDynamic Information RoutingGain Modulation
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Brain-Score 94/100 WISE Channel · 33:30

How the Brain Learns to Read - Prof. Stanislas Dehaene

  1. Brain imaging (fMRI, EEG, MEG) shows learning to read recycles pre-existing visual and auditory circuits for letters and phonemes.
  2. Early mirror writing in children reflects inherited visual symmetry invariance rather than dyslexia as reading reorganizes cortex.
  3. Reward chemistry and sleep consolidate literacy, while regular orthographies let children learn to read far faster than English.
Neuronal RecyclingfMRI, EEG & MEG ImagingMirror-Writing StageSleep ConsolidationOrthographic Regularity
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Brain-Score 94/100 DR MEDIC · 3:05

AMPA and NMDA Receptors

  1. At resting membrane voltages, magnesium ions block NMDA pores so weak glutamate release activates only AMPA receptors.
  2. Strong AMPA-driven depolarization expels the Mg2+ block, allowing NMDA channels to admit calcium ions into the spine.
  3. Calcium-calmodulin activates CaMKII to phosphorylate and insert more AMPA receptors, driving long-term potentiation (LTP).
AMPA & NMDA ReceptorsVoltage-Dependent Mg2+ BlockCaMKII Signaling CascadeNitric Oxide Retrograde SignalLong-Term Potentiation (LTP)
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Brain-Score 94/100 Roger Sperry History · 10:31

Gazzaniga explains Split Brain in Sperry Lab

  1. In Sperry's Caltech lab, severing the corpus callosum and optic chiasm isolated cerebral hemispheres without altering animal behavior.
  2. In split-brain patients, right-field images reach the verbal left hemisphere and are named, while left-field inputs go unreported.
  3. Disconnected hemispheres control opposite hands independently and even clash on tasks, localizing speech, learning, and memory.
Corpus Callosum SectioningOptic Chiasm IsolationVisual Field LateralizationContralateral Hand ControlHemispheric Specialization
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Brain-Score 94/100 Quanta Magazine · 2:37

Did Intelligence Evolve Twice?

  1. Birds exhibit tool use and problem-solving comparable to 7-year-old children despite lacking a mammalian layered neocortex.
  2. Avian higher cognition relies on the dorsal ventricular ridge (DVR), which packs neurons far more densely than mammal brains.
  3. Molecular studies of a 320-million-year-old ancestor show the neocortex and DVR evolved independently from distinct cell types.
Convergent EvolutionDorsal Ventricular Ridge (DVR)Mammalian NeocortexAvian Neuron Density
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Brain-Score 94/100 Dr Matt & Dr Mike · 7:50

Action Potential | Neuron

  1. A resting neuron sits at -70 mV with sodium concentrated outside the cell and potassium concentrated inside.
  2. Excitatory neurotransmitters like glutamate drive sodium influx to -55 mV, opening voltage-gated sodium channels up to +30 mV.
  3. Potassium efflux repolarizes and hyperpolarizes the cell before pumps export 3 sodium and import 2 potassium ions to reset it.
Resting Potential (-70 mV)Threshold Potential (-55 mV)Voltage-Gated Ion ChannelsDepolarization & Repolarization3 Na+ / 2 K+ Membrane Pump
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Brain-Score 94/100 MITCBMM · 7:55

6.4 - Head Direction Cells, Grid Cells, and Border Cells

  1. Alongside hippocampal place cells, surrounding head direction cells fire selectively for a specific 360° facing orientation.
  2. Grid cells discovered by the Mosers fire in repeating hexagonal lattices, supporting dead reckoning via path integration.
  3. Border cells encode proximity to walls and barriers, linking with spatial-shape representations like the PPA to guide navigation.
Head Direction CellsHexagonal Grid CellsPath Integration (Dead Reckoning)Border CellsHippocampal Place Cells
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Brain-Score 94/100 AMBOSS: Medical Knowledge Distilled · 8:16

Energy Metabolism - Part 9: The Cori Cycle

  1. Muscle soreness stems from microtrauma, not lactate; anaerobically, LDH (isoenzymes 1–5) reduces pyruvate to lactate to regenerate NAD+.
  2. In the Cori cycle, muscle-derived lactate travels via blood to the liver, where gluconeogenesis resynthesizes glucose for working muscle.
  3. Serum LDH above normal (45–200 U/L, excluding sample hemolysis) signals cell injury: LDH1/LDH2 in heart or kidney infarct, LDH3 in lung.
Cori Cycle (Muscle-Liver Exchange)Lactate Dehydrogenase (LDH1–LDH5)Anaerobic NAD+ RegenerationHepatic GluconeogenesisSerum LDH Diagnostics (45–200 U/L)
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Brain-Score 94/100 Ninja Nerd · 23:51

Immunology | T- Cell Development

  1. T-cell precursors originate in red bone marrow and travel through sinusoidal capillaries to the thymus for maturation and selection.
  2. RAG-1 and RAG-2 recombinases shuffle DNA segments to generate diverse T-cell receptors (TCRs) specific to distinct foreign antigens.
  3. Double-positive thymocytes commit to CD4 or CD8 lineages via MHC Class II or I binding before migrating to secondary lymphoid organs.
Thymic T-Cell MaturationRAG-1 / RAG-2 RecombinaseTCR Gene RearrangementMHC I & II Lineage SelectionSecondary Lymphoid Homing
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Brain-Score 94/100 PhysioPathoPharmaco · 6:01

Pathogenesis of Atherosclerosis

  1. Hypertension, smoking, high glucose, or high LDL damages arterial endothelium, letting LDL enter the intima and capturing monocytes.
  2. Leukocyte free radicals oxidize LDLs, driving a positive-feedback loop as macrophages engulf lipids into foam cells and plaques.
  3. Compromised plaque endothelium loses antithrombotic signaling, risking plaque rupture, an attached thrombus, or a mobile embolus.
Endothelial DysfunctionMonocyte DiapedesisLDL Oxidation & Foam CellsTunica Intima PlaqueThrombus & Embolus
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Brain-Score 94/100 Serious Science · 15:07

Free Energy Principle — Karl Friston

  1. Living systems resist random dispersion—unlike diffusing ink—by maintaining a Markov blanket of sensory and active states.
  2. Brain anatomy must mirror the world's sparse, hierarchical causal structure to perform Helmholtzian unconscious inference.
  3. Neuronal and physiological dynamics can be cast as differential equations that optimize Bayesian model evidence over time.
Free Energy PrincipleMarkov BlanketUnconscious InferenceBayesian Model EvidenceHelmholtz Machine
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Brain-Score 94/100 Artem Kirsanov · 11:11

Memory Consolidation: Time Machine of the Brain

  1. During sleep, the brain enters an active offline state where hippocampo-cortical dialogue stabilizes new memories into long-term storage.
  2. The hippocampus emits brief high-frequency bursts called sharp-wave ripples that coordinate memory transfer without external input.
  3. Within sharp-wave ripples, waking place-cell sequences replay in fast reverse to evaluate past paths and forward to plan future actions.
Hippocampo-Cortical ConsolidationSharp-Wave Ripples (SWRs)Hippocampal Place CellsFast-Reverse & Forward ReplayOffline Brain State
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Brain-Score 94/100 TED · 17:31

How reliable is your memory? | Elizabeth Loftus

  1. Human memory is reconstructive rather than a fixed recording, allowing post-event suggestions to rewrite what people recall.
  2. Leading questions—such as asking how fast cars 'smashed' vs 'hit'—inflate speed estimates and plant false details like glass.
  3. Because rich false childhood memories can be planted, confidence and emotion never replace independent corroboration.
Reconstructive MemoryMisinformation EffectLeading QuestionsFalse Memory ImplantationIndependent Corroboration
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Brain-Score 94/100 Armando Hasudungan · 11:24

Apoptosis - internal and external pathways

  1. Internal stress like DNA damage releases mitochondrial cytochrome c, which binds APAF-1 to form the apoptosome and activate caspase-9.
  2. Extrinsic death signaling activates initiator caspases and cleaves Bid into tBid, amplifying mitochondrial cytochrome c release.
  3. Both pathways converge on executioner caspases-3 and -7, packaging cell fragments into apoptotic bodies for inflammation-free clearance.
Cytochrome c & APAF-1 apoptosomeInitiator caspase-9 activationTruncated Bid (tBid) crosstalkExecutioner caspases-3 and -7Non-inflammatory apoptotic bodies
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Brain-Score 94/100 Brains Explained · 10:00

The Cerebellum

  1. Holding over half of all brain neurons, the cerebellum routes mossy and climbing fibers to Purkinje cells for motion.
  2. Co-activating parallel and climbing fibers internalizes Purkinje glutamate receptors, inducing long-term depression.
  3. Inferior olivary neurons oscillate at 1–10 Hz across gap junctions to supply timing and error signals for motor skill.
Purkinje CellsParallel & Climbing FibersLong-Term Depression (LTD)Inferior Olivary ComplexGap Junction Oscillations
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Brain-Score 94/100 Ninja Nerd · 38:08

Neurology | Brachial Plexus

  1. The brachial plexus arises from spinal nerves C5–T1 and organizes into roots, trunks, divisions, cords, and branches.
  2. Proximal branches like the dorsal scapular and C5–C7 long thoracic nerves innervate the rhomboids and serratus anterior.
  3. Terminal musculocutaneous, axillary, radial, median, and ulnar nerves govern motor and sensory function in the upper limb.
Brachial Plexus (C5–T1)Roots-Trunks-Divisions-CordsLong Thoracic NerveRadial & Axillary NervesUlnar & Median Nerves
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Brain-Score 94/100 Focused Physiology · 8:57

How Glomerular Filtration Rate is Determined by Hydrostatic and Oncotic Pressures

  1. Glomerular filtration rate (GFR) equals net filtration pressure times the filtration coefficient (Kf) of glomerular capillaries.
  2. Glomerular hydrostatic pressure (~60 mmHg) drives ultrafiltration against Bowman's back-pressure (~18 mmHg) and oncotic pressure (~32 mmHg).
  3. A 10 mmHg net pressure across highly conductive capillaries (Kf ~12.6 mL/min/mmHg) yields ~126 mL/min of plasma filtration.
Glomerular Filtration RateStarling ForcesHydrostatic PressurePlasma Oncotic PressureFiltration Coefficient (Kf)
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Brain-Score 94/100 The Noted Anatomist · 11:55

Starling Forces: Hydrostatic vs Oncotic Pressures and Edema

  1. Capillary hydrostatic pressure pushes plasma fluid into interstitial tissue, while albumin's oncotic pull draws water back into vessels.
  2. The Starling equation weights net pressure by the filtration coefficient Kf, combining membrane water permeability and surface area.
  3. Because net filtration exceeds reabsorption, lymphatic vessels and ducts return excess interstitial fluid to veins to prevent edema.
Starling EquationCapillary Hydrostatic PressureAlbumin Oncotic PressureFiltration Coefficient (Kf)Lymphatic Fluid Return
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Brain-Score 94/100 TED-Ed · 5:28

The benefits of a good night's sleep - Shai Marcu

  1. Ebbinghaus showed we forget 40% of new material in 20 minutes unless the hippocampus consolidates it into long-term memory.
  2. Non-REM slow-wave sleep reactivates declarative memories and redistributes them to permanent storage in the cortex.
  3. REM sleep consolidates procedural skills, making sleep far more effective for retention than late-night cramming.
Memory ConsolidationEbbinghaus Forgetting CurveHippocampusSlow-Wave Non-REM SleepREM Procedural Memory
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Brain-Score 94/100 Professor Dave Explains · 9:29

Natural Killer Cells: The Tumor Killers

  1. NK cells make up 5–15% of blood lymphocytes, balancing activating and inhibitory receptors to detect tumor or virus-infected cells.
  2. CD56bright NK cells rapidly secrete cytokines like IFN-γ, while circulating CD56dim subsets directly lyse susceptible target cells.
  3. Killing forms an immunological synapse, polarizes MTOC and lysosomes to release perforin and granzyme, or engages death receptors.
Natural Killer (NK) CellsCD56bright vs CD56dimImmunological SynapsePerforin & GranzymeMTOC Degranulation
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Brain-Score 94/100 Immunology Toronto · 4:03

Antibody affinity maturation

  1. In lymph node germinal centers, the enzyme AID induces antibody-gene point mutations at one million times the baseline rate.
  2. Hypermutated centrocytes compete to capture limited antigen on follicular dendritic cells and present it to T cells for survival.
  3. Low-affinity B cells undergo apoptosis while surviving high-affinity clones cycle further and become antibody-secreting plasma cells.
Affinity MaturationGerminal CenterAID Somatic HypermutationFollicular Dendritic CellsClonal Selection
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Brain-Score 94/100 khanacademymedicine · 6:11

Language and the brain: Aphasia and split-brain patients | MCAT | Khan Academy

  1. Language lateralizes to the left hemisphere in ~90% of right-handers, relying on Broca's area for speech and Wernicke's for comprehension.
  2. Damage to the arcuate fasciculus causes conduction aphasia, impairing repetition, though synaptic plasticity aids post-stroke recovery.
  3. Severing the corpus callosum blocks interhemispheric transfer, so left-visual-field objects reaching the right brain cannot be named.
Broca's & Wernicke's AreasArcuate FasciculusConduction AphasiaSynaptic PlasticityCorpus Callosum & Split-Brain
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Brain-Score 94/100 Armando Hasudungan · 9:34

Hypersensitivity Type I reaction (Immediate or allergic reaction) - pathophysiology

  1. First exposure to a benign allergen primes T helper cells and IL-4 to switch B cells toward mast-cell-bound IgE.
  2. Upon re-exposure, allergen cross-links IgE on mast cells, releasing histamine within minutes to cause vasodilation and edema.
  3. Hours later, arachidonic acid mediators like leukotrienes and prostaglandins drive bronchoconstriction and eosinophil influx.
IgE Class Switching (IL-4)Mast Cell DegranulationHistamine Immediate PhaseArachidonic Acid PathwayAtopic Predisposition
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Brain-Score 94/100 Ninja Nerd · 44:34

Neurology | Neuron Anatomy & Function

  1. Neurons receive signals at dendrites, integrate them in the soma, and transmit impulses down axons to synaptic terminals.
  2. Kinesin motor proteins carry vesicles, enzymes, and ATP-producing mitochondria down microtubules via anterograde transport.
  3. Multipolar, bipolar, and pseudounipolar neurons link sensory receptors, CNS interneurons, and motor muscle pathways.
Neuron MorphologyAnterograde Axonal TransportKinesin & MicrotubulesStructural Neuron ClassesSensory-Motor Reflex Arc
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Brain-Score 94/100 Alila Medical Media · 4:00

The Vestibular System, Animation

  1. Three orthogonal semicircular canals detect rotational acceleration as lagging endolymph bends hair-cell cilia inside the cupula.
  2. Two perpendicular otolithic organs—the horizontal utricle and vertical saccule—use weighted otoconia crystals to sense gravity and motion.
  3. Brainstem pathways drive the vestibulo-ocular reflex to stabilize vision and the vestibulospinal reflex to maintain balance.
Semicircular CanalsUtricle & SacculeEndolymph & CupulaOtoconia CrystalsVestibulo-Ocular Reflex
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Brain-Score 94/100 Physio Flip · 13:46

Excitation Contraction Coupling and the Neuromuscular Junction | Skeletal Muscle Contraction

  1. Motor-neuron acetylcholine triggers T-tubule action potentials, causing DHP receptors to pull open RyR calcium channels.
  2. Released Ca2+ lets myosin bind actin, execute a phosphate-release power stroke, and bind fresh ATP to detach and repeat.
  3. In rigor mortis, decaying membranes leak Ca2+ to contract fibers, while ATP depletion locks myosin onto actin.
Excitation-Contraction CouplingDHP & RyR ReceptorsActin-Myosin Cross-BridgeSliding Filament TheoryRigor Mortis Mechanism
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Brain-Score 94/100 Medicurio · 11:51

Opioid Drugs, Part 1: Mechanism of Action

  1. Opioid drugs mimic endogenous endorphins, enkephalins, and dynorphins by binding neuronal G-protein opioid receptors.
  2. Activated Gαi/o subunits inhibit adenylyl cyclase, lowering cAMP levels and suppressing neurotransmitter release.
  3. Opioids block spinal pain signals and inhibit brainstem GABA interneurons, disinhibiting descending pain suppression.
Endogenous Opioid PeptidesGαi/o & Adenylyl CyclasecAMP & Protein KinaseVoltage-Gated Ion ChannelsDescending Pain Pathway
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Brain-Score 94/100 Ninja Nerd · 31:42

Respiratory | Mechanics of Breathing: Pressure Changes | Part 1

  1. Visceral pleura clings to the alveoli-filled lungs while parietal pleura lines the chest wall, forming the intrapleural cavity.
  2. Inward lung elastance and alveolar surface tension pull visceral pleura away from the outward-recoiling chest wall.
  3. Expanding pleural space volume lowers intrapleural pressure, while gravity creates regional pressure gradients from apex to base.
Visceral & Parietal PleuraIntrapleural PressureLung Elastance & Surface TensionChest Wall Elastic RecoilGravity Pressure Gradient
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Brain-Score 94/100 Alila Medical Media · 3:49

Olfactory System: Anatomy and Physiology, Pathways, Animation.

  1. Mucus-dissolved odorants bind ~400 G-protein receptors combinatorially on olfactory cilia to trigger action potentials.
  2. Cranial nerve I axons converge by receptor type onto bulb glomeruli, synapsing on mitral and tufted cells under feedback.
  3. Epithelial stem cells continually replace olfactory neurons, whereas total loss or neurodegeneration causes anosmia.
Combinatorial Odor CodingG-Protein Odorant ReceptorsOlfactory Bulb GlomeruliMitral & Tufted CellsOlfactory Neurogenesis
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Brain-Score 94/100 Brains Explained · 13:12

The Neocortex

  1. Layer 4 cortical simple cells integrate aligned thalamic LGN inputs to detect specific edge orientations.
  2. Layers 2/3 form recurrent excitatory subnetworks under general inhibition, feeding Layer 5 output projections.
  3. Layer 6 sends feedback to modulate thalamic gain, while synaptic plasticity rewires circuits with experience.
Six-Layer Cortical CircuitLayer 4 Simple CellsLateral InhibitionCorticothalamic FeedbackSynaptic Plasticity
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Brain-Score 93/100 Laura Slusser · 4:43

The Retina - Bipolar Cells, Horizontal Cells, and Photoreceptors

  1. Retinal photoreceptors release glutamate in the dark and stop releasing glutamate when struck by light.
  2. Glutamate depolarizes OFF-bipolar cells to speed ganglion firing, yet hyperpolarizes ON-bipolar cells.
  3. Dark surround photoreceptors drive horizontal cells to release GABA, sharpening center-surround contrast.
Dark Glutamate ReleaseON vs. OFF Bipolar CellsHorizontal Cell GABA InhibitionCenter-Surround Receptive FieldGanglion Firing Rate Coding
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Brain-Score 93/100 Dr Matt & Dr Mike · 5:25

Basic Breathing Mechanics

  1. During inhalation, the diaphragm pulls downward and external intercostals lift the ribs outward to expand thoracic cavity volume.
  2. By Boyle's Law, increased thoracic volume drops intrapulmonary pressure below atmospheric pressure, drawing air into the lungs.
  3. Quiet exhalation uses passive elastic recoil, while forced exhalation contracts internal intercostals and abdominals to expel air.
Boyle's Law Pressure-VolumeDiaphragm ContractionExternal & Internal IntercostalsPulmonary Elastic RecoilActive Abdominal Expiration
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Brain-Score 93/100 Ninja Nerd · 7:35

Endocrinology | Thyroid Overview

  1. Hypothalamic paraventricular neurons secrete TRH into the portal system, prompting pituitary thyrotropes to release TSH.
  2. Circulating T3 and T4 regulate the hypothalamic-pituitary-thyroid axis via negative feedback on TRH and TSH secretion.
  3. Thyroid hormones raise basal metabolic rate, boost hepatic LDL uptake, support cardiac output, and drive CNS myelination.
HPT AxisNegative Feedback LoopTRH & TSH SignalingBasal Metabolic RateHepatic LDL Uptake
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Brain-Score 93/100 LastingLearning.com · 3:51

The Power of Forgetting, Dr. Robert Bjork

  1. Memory splits into retrieval strength (current accessibility) and storage strength (how entrenched an item is in memory).
  2. High current retrieval strength from cramming limits storage gains, whereas forgetting opens room for stronger relearning.
  3. Spacing study sessions, reducing cues, and varying study locations induce temporary forgetting that boosts long-term retention.
Retrieval StrengthStorage StrengthSpaced PracticeContext VariationForgetting-Driven Learning
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Brain-Score 93/100 Peter Johns · 18:22

Vertigo Myth: BPPV = Dix-Hallpike test, the patient gets dizzy, and you see nystagmus

  1. Confirming posterior canal BPPV on the Dix-Hallpike test requires upbeat vertical plus torsional nystagmus toward the downward ear.
  2. Horizontal nystagmus points to horizontal canal BPPV instead, and Dix-Hallpike testing must be avoided when spontaneous nystagmus exists.
  3. Holding a blank sheet of paper close to the patient's head removes visual fixation to unmask subtle peripheral nystagmus during HINTS.
Dix-Hallpike ManeuverPosterior vs Horizontal BPPVUpbeat Torsional NystagmusEpley Canalith RepositioningPaper Fixation Removal
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Brain-Score 93/100 Ninja Nerd · 23:57

Immunology | Inflammation: Complement Proteins: Part 3

  1. Liver-derived complement proteins activate via antibody-led classical, direct C3b alternative, or mannose-binding lectin pathways.
  2. Subunits C5b through C9 assemble the Membrane Attack Complex (MAC), forming pores that flood and lyse bacterial cells.
  3. Pathogen-bound C3b drives opsonization for phagocytes, while fragments C3a and C5a boost inflammation via chemotaxis.
Complement CascadeMembrane Attack Complex (MAC)C3b OpsonizationClassical, Lectin & AlternativeC3a/C5a Chemotaxis
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Brain-Score 93/100 Serious Science · 12:38

Spatial Navigation — Neil Burgess

  1. John O'Keefe discovered hippocampal place cells—neurons that fire selectively whenever an animal occupies a specific location in space.
  2. Adjacent entorhinal grid cells fire in regular, phase-shifted spatial lattices that continuously update position from self-motion.
  3. Mapping hippocampal-entorhinal navigation circuits explains disorientation in Alzheimer's disease and guides human-like robotics.
Hippocampal place cellsEntorhinal grid cellsSelf-motion path updatingSpatial memory mappingVirtual-reality neuroimaging
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Brain-Score 93/100 Benjamin Keep, PhD, JD · 6:29

How to do free recall (AKA active recall) - Language learning demonstration

  1. Study 20 to 30 items, step away for 15 minutes, then write everything you remember on blank paper with the book closed.
  2. Check the source for five minutes to fix gaps, wait a few hours, and repeat on a fresh sheet while clustering related ideas.
  3. Blank-page free recall actively organizes memory, reduces interference between similar items, and guides spacing intervals.
Free RecallActive Retrieval PracticeSpaced IntervalsMemory InterferenceConcept Clustering
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Brain-Score 93/100 Dr Cailbhe Doherty · 14:50

The Physiology of Running Faster for Longer: VO2max, Lactate Threshold & Running Economy

  1. Michael Joyner modeled a 1:57:58 marathon limit from three physiological traits: VO2max, lactate threshold, and running economy.
  2. Anaerobic glycolysis yields 2 ATP per sugar rapidly, but accumulating hydrogen ions acidify muscle cells and cause sprint fatigue.
  3. Elite marathons run at 80–90% VO2max, relying on aerobic Type 1 slow-twitch fibers for lower oxygen cost and better economy.
VO2max (Aerobic Capacity)Lactate ThresholdRunning EconomyAnaerobic Glycolysis & H+ AcidosisType 1 vs Type 2A/2X Fibers
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Brain-Score 93/100 Armando Hasudungan · 4:55

Hypothalamic Pituitary Thyroid Axis (regulation, TRH, TSH, thyroid hormones T3 and T4)

  1. Hypothalamic PVN neurons release TRH into portal blood, stimulating the anterior pituitary to secrete TSH.
  2. TSH prompts thyroid follicular cells to produce thyroglobulin and import iodide to synthesize T3 and T4 in colloid.
  3. Circulating T3 and T4 elevate cellular metabolism while suppressing TRH and TSH via negative feedback.
HPT Axis (TRH & TSH)T3/T4 Negative FeedbackSodium-Iodide ChannelsThyroglobulin & Colloid
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Brain-Score 93/100 AnatomyZone · 6:07

External Ear | Anatomy Tutorial

  1. The external ear combines the sound-capturing cartilaginous auricle (helix, antihelix, concha, tragus, lobule) and auditory canal.
  2. Sensory innervation blends CN VII, CN X, and auriculotemporal (CN V3) branches with cervical plexus greater auricular nerves.
  3. The angled tympanic membrane anchors to the malleus at the umbo, reflects an otoscopic cone of light, and has tensa/flaccida zones.
Auricle (Pinna) CartilageExternal Auditory MeatusCranial & Cervical NervesTympanic Membrane & UmboPars Tensa vs Pars Flaccida
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