In muscle contraction, the breaking of the cross-bridge between actin and myosin is caused by ____
a. hydrolysis of ATP into ADP plus Pi
b. formation of ATP from ADP and Pi
c. release of Pi from the myosin head
d. binding of a new ATP to the myosin head
e. return of myosin to a high-energy state
ANSWER: d
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1.A
2.B
3.C
4.D
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