Multiple Choice
In skeletal muscle sarcomeres, which protein is the primary component of the thick filaments?
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8. Protein Function
Skeletal Muscle Contraction
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In skeletal muscle cross-bridge cycling, what is the primary role of ATP binding and hydrolysis on the myosin head?
A
ATP binding directly causes the power stroke by pulling actin past myosin.
B
ATP binding detaches myosin from actin, and ATP hydrolysis cocks (energizes) the myosin head for the next power stroke.
C
ATP hydrolysis increases cytosolic by opening ryanodine receptors on the sarcoplasmic reticulum.
D
ATP binding exposes myosin-binding sites on actin by moving tropomyosin away from the binding groove.
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