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Neuron action potential description | Nervous system physiology | NCLEX-RN | Khan Academy
Neuron action potential description | Nervous system physiology | NCLEX-...
Khan Academy
Image showing what happens when action potential arrives at axon terminal, causing ion flow and depolarization of target cell. Step by step: 1. Action potential reaches axon terminal and depolarizes membrane. 2. Voltage-gated calcium channels open and calcium ions flow in. 3. Calcium ion influx triggers synaptic vesicles to release neurotransmitter. 4. Neurotransmitter binds to receptors on target cell (in this case, causing positive ions to flow in).