Acetylcholine
A) binds to the myosin head, enabling it to form cross-bridges with actin.
B) is released from the sarcoplasmic reticulum and binds to actin.
C) breaks down the neurotransmitter that activates muscle fibers.
D) binds to the sarcolemma and initiates an impulse in the muscle fiber.
Correct Answer:
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A) is released by the sarcoplasmic reticulum.
B)
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