Question

What happens at the terminal cisternae when the action potential reaches it?

a. Acetylcholine is released into the synaptic cleft.
b. Action potential propagates along the sarcolemma and down the T tubules.
c. Synaptic vesicles fuse to the membrane of the axon terminal.
d. Action potential is initiated on the sarcolemma.
e. Calcium ions are released from the terminal cisternae.
f. Acetylcholine binds to receptor sites on the motor end plate.
g. Calcium ions enter the axon terminal.

Answer 1

When the action potential reaches the terminal cisternae:

e. Calcium ions are released from the terminal cisternae.

This release of calcium ions plays a crucial role in muscle contraction by triggering events that lead to the sliding of actin and myosin filaments.