Which ion is necessary for the release of neurotransmitter from synaptic vesicles?

A) Cl⁻
B) Na⁺
C) K⁺
D) Ca²⁺

Synaptic Vesicles

Membrane-bound sacs within presynaptic neurons that store neurotransmitters, which are released into the synaptic cleft to transmit signals to other neurons.

Neurotransmitter

Chemical substances released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.

Ion

An atom or molecule with a net electric charge due to the loss or gain of one or more electrons, essential in a wide array of biological processes.