Action Potential Basics — Reviewed AI Example
18 intermediate neurobiology flashcards covering resting potential, action-potential phases, refractory periods, conduction speed, and synaptic transmission. This deck is the exact reviewed final artifact from Memor More's 9 September 2026 PDF-to-flashcards test; it demonstrates one real workflow, not a general accuracy guarantee.
This is a free, public flashcard deck on Memor More containing 18 cards about Medical & Healthcare, covering neurobiology, action-potentials, synapses for learning English from English. Estimated study time: 10 min. Preview it here, then copy it into the early browser app to study or edit. The full native app is available on iPhone, iPad, and Mac.
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Source workflow: read the documented notes-to-flashcards example
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Cards in this deck
#1
Q:Absolute refractory period
- A:A period during which no stimulus, regardless of strength, can trigger another action potential.
#2
Q:All-or-none principle
- A:The principle that a neuron either fires a full action potential or does not fire at all, with no partial firing.
#3
Q:Axon diameter and conduction speed
- A:Larger axon diameter increases the conduction speed of action potentials.
#4
Q:Depolarisation
- A:The phase of the action potential where voltage-gated sodium channels open, Na+ flows into the cell, and membrane potential peaks near +30 to +40 mV.
#5
Q:Hyperpolarisation
- A:A phase where the membrane potential briefly falls below the resting potential before returning to -70 mV.
#6
Q:Myelinated axons
- A:Axons that conduct action potentials faster than unmyelinated axons due to saltatory conduction between nodes of Ranvier.
#7
Q:Neurotransmitter clearance
- A:Neurotransmitter is cleared from the synaptic cleft by reuptake or enzymatic breakdown after binding to postsynaptic receptors.
#8
Q:Relative refractory period
- A:A period during which a stronger than normal stimulus is required to trigger another action potential.
#9
Q:Repolarisation
- A:The phase where sodium channels close, voltage-gated potassium channels open, and K+ flows out of the cell, bringing the membrane potential back down.
#10
Q:Resting membrane potential
- A:About -70 mV, with the inside of the neuron negative relative to the outside.
#11
Q:Role of Ca2+ in synaptic transmission
- A:Ca2+ enters the axon terminal, causing vesicles to fuse with the membrane and release neurotransmitter into the synaptic cleft.
#12
Q:Saltatory conduction
- A:Conduction in which the action potential signal jumps between nodes of Ranvier along myelinated axons, increasing conduction speed.
#13
Q:Sodium-potassium pump
- A:A protein that maintains the ion gradient using ATP, moving 3 Na+ out of the cell for every 2 K+ it moves in.
#14
Q:Synaptic cleft
- A:The gap between the presynaptic and postsynaptic neuron into which neurotransmitter is released.
#15
Q:Threshold (in neuron firing)
- A:About -55 mV; depolarisation that reaches this level triggers an action potential.
#16
Q:Voltage-gated potassium channels
- A:Channels that open during repolarisation, allowing K+ to flow out of the neuron and restore the membrane potential toward resting levels.
#17
Q:Voltage-gated sodium channels
- A:Channels that open during depolarisation, allowing Na+ to flow into the neuron and drive the membrane potential upward.
#18
Q:What are the nodes of Ranvier?
- A:Gaps in the myelin sheath along an axon where the action potential signal jumps during saltatory conduction.