The ion that triggers the release of neurotransmitters into the cleft is _____. A) Na⁺ B) K⁺ C) Ca²⁺ D) Cl^-

Question

Quizplus · Accepted Answer

The ion that triggers the release of neurotransmitters into the cleft is calcium (Ca2+). When an action potential reaches the axon terminal, it causes voltage-gated calcium channels to open, allowing Ca2+ ions to flow into the cell. This influx of Ca2+ triggers the release of neurotransmitter molecules from vesicles into the synaptic cleft. The other options listed are either incorrect ions (Na+, K+) or do not play a role in triggering neurotransmitter release (Cl-).

The Ion That Triggers the Release of Neurotransmitters into the Cleft