The neurotransmitter that initiates muscle contraction is ________
A) acetylcholine
B) aponeurosis
C) buccinator
D) fascicle
A
Explanation: A) Correct!
B) An aponeurosis is a structure, not a neurotransmitter.
C) Buccinator is a muscle, not a neurotransmitter.
D) A fascicle is a group of muscle fibers, not a neurotransmitter.
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