Sequence the Following Events Involved in Muscle Cell Contraction

Multiple Choice

Sequence the following events involved in muscle cell contraction:
1) Sodium channels open and sodium flows in.
2) Impulse reaches the axon's terminal.
3) ACh binds to receptors on the muscle cell membrane.
4) Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis.
5) If enough sodium moves in to the muscle cell, an impulse (action potential) develops.

A) 1, 2, 3, 4, 5
B) 2, 1, 3, 4, 5
C) 2, 4, 3, 1, 5
D) 3, 4, 5, 1, 2
E) 3, 5, 2, 1, 4