At What Point During Excitation Contraction Coupling Does Exocytosis Play

Question

At what point during excitation contraction coupling does exocytosis play a role?
A) during calcium ion reuptake into the sarcoplasmic reticulum
B) when sodium channels open up on the motor end plate
C) during acetylcholine release from the synaptic terminal
D) when the action potential surges through the T-tubules
E) when ATP splits into ADP and P on the free myosin head

Accepted Answer

Exocytosis plays a role during acetylcholine release from the synaptic terminal, which triggers the opening of sodium channels on the motor end plate and initiates the excitation contraction coupling process.