What ion directly triggers neurotransmitter release from the presynaptic neuron?
A) sodium
B) calcium
C) potassium
D) magnesium
E) chloride

Question

Quizplus · Accepted Answer

Calcium ions (Ca2+) are directly responsible for triggering neurotransmitter release from the presynaptic neuron. When an action potential reaches the axon terminal, it causes voltage-gated calcium channels to open, allowing Ca2+ to enter the neuron. This influx of calcium ions initiates the fusion of synaptic vesicles with the presynaptic membrane, leading to the release of neurotransmitters into the synaptic cleft.

What Ion Directly Triggers Neurotransmitter Release from the Presynaptic Neuron