When a depolarization occurs in the presynaptic terminal and Ca²⁺ channels open there is a large global rise in Ca²⁺ concentration. Defend your answer.

Question

Quizplus · Accepted Answer

Most Ca²⁺ channels are located next to vesicles in the active zone of the presynaptic membrane. When Ca²⁺ channels open there are local increases in Ca²⁺, or microdomains in the presynaptic terminal with a large increase in calcium concentration.

When a Depolarization Occurs in the Presynaptic Terminal and Ca2+

When a Depolarization Occurs in the Presynaptic Terminal and Ca²⁺