Multiple Choice
Which of the following can the neurotransmitter acetylcholine do in vertebrates?
A) act as a hormone when released into the circulation
B) make it more difficult for some presynaptic membranes to reach threshold
C) act as a direct neurotransmitter between neurons and muscle cells
D) act as an enzyme when released into circulation
Correct Answer:

Verified
Correct Answer:
Verified
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