Which of the following statements correctly describes calcium's role in exocytosis?
A) Calcium has no role in exocytosis.
B) Calcium stimulates autoreceptors.
C) Calcium releases synaptic vesicles from their protein anchors.
D) Calcium moves neurotransmitter molecules back into synaptic vesicles.

Question

Quizplus · Accepted Answer

Calcium is essential for exocytosis as it plays a crucial role in releasing synaptic vesicles from their protein anchors. The influx of calcium ions into the presynaptic terminal triggers the release of neurotransmitter molecules stored in the synaptic vesicles, facilitating their binding with the receptors on the postsynaptic membrane. Autoreceptors (Option B) are not stimulated by calcium; instead, they regulate the release of neurotransmitter. Option A is incorrect as calcium is crucial for exocytosis. Option D is also incorrect as calcium does not move neurotransmitter molecules back into the vesicles.

Which of the Following Statements Correctly Describes Calcium's Role in Exocytosis