A Muscle Fiber Contracts by a Sequence of Events Initiated

question 54

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

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