The binding of ATP immediately initiates the sliding of muscle filaments past one another.Group startsTrue or False
Question
The binding of ATP immediately initiates the sliding of muscle filaments past one another.Group startsTrue or False
Solution
False. The binding of ATP to myosin is not what initiates the sliding of muscle filaments. The hydrolysis of ATP into ADP and inorganic phosphate provides the energy needed for the power stroke of the myosin head, which causes the sliding of the filaments. The binding of ATP is actually what allows the myosin head to detach from the actin filament after the power stroke, resetting the system for another cycle.
Similar Questions
Which of the following happens as actin and myosin filaments slide past each other during muscle contraction?
During muscle contraction, the power stroke is the pivoting motion of the myosin head that pulls the actin filament inward to shorten the sarcomere. Given this, which of the following events most immediately precedes this power stroke motion?A.The binding of ATP to the myosin headsB.The hydrolysis of myosin-bound ATPC.The release of Pi from the myosin headD.The binding of Ca2+ to tropomyosin
Contraction of muscle fibre takes place by the sliding of :-A Thin filaments over the actin filaments B Thick filaments over the thin filaments C Thin filaments over the thick filaments D Thick filaments over the myosin filaments
When cross-bridges form and the muscle fibers contract, the actin myofilament slides past the myosin myofilament.Group startsTrue or False
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