Exocytosis of secretory products is triggered by the entry of ____ into the cell in response to a specific neural or hormonal stimulus.

Question

Quizplus · Accepted Answer

Calcium ions (Ca2+) are the key intracellular signals that activate exocytosis in response to a specific neural or hormonal stimulus. When Ca2+ enters the cell through voltage-gated calcium channels or receptor-activated calcium channels, it binds to specific proteins called synaptotagmins, which trigger the fusion of secretory vesicles with the plasma membrane, releasing their contents outside the cell. Therefore, option C, Ca²⁺, is the best choice. The other options do not accurately reflect the mechanism of exocytosis.

Exocytosis of Secretory Products Is Triggered by the Entry of ____