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Question 20 / 30:  What is step 5 of muscle contraction?
A  A new ATP binds to myosin head, allowing it to release from actin.
B  Power stroke causes filaments to slide; ADP is released.
C  ATP is hydrolyzed, causing cross bridge to return to its original orientation.
D  Resting fiber; cross bridge is not attached to actin.
E  Cross bridge binds to actin.
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ZOOL113 Muscular System

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