★ Anatomy - Muscle Histology/NMJ/Physiology Quiz
What is the contractile unit of the muscle?
A. Z disk
B. Sarcomere
C. Muscle fiber
D. Muscle cell
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Which of these occurs first during a muscle contraction?
A. The nerve signal reaches the neuromuscular junction
B. Ach is released and opens Na ion channels
C. The sarcomere shortens
D. The myosin binds to the actin
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