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
C
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