A Muscle Fiber Contracts by a Sequence of Events Initiated

question 9

Multiple Choice

A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor.Which of the following is the correct sequence? I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin.II-The freed-sites of actin bind to myosin to form cross bridges.III-Calcium ion binds to the troponin.

• A)II, III, and I
• B)III, II, and I
• C)III, I, and II
• D)I, III, and II

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