Answered

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Where do the myosin heads get their energy to reset their position to 90 degrees?

A. Actin creates ATP.
B. From ATP broken down from the previous contraction cycle by the ATPase portion of Myosin.
C. F-Actin creates ATP.
D. The binding of Ca2+ causes the formation of ATP.

Sagot :

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Final answer:

Myosin heads reset their position using energy from ATP hydrolysis for muscle contraction and relaxation cycles.


Explanation:

Myosin heads reset their position to 90 degrees by using energy derived from ATP hydrolysis. When ATP binds to myosin, it gets converted to ADP and inorganic phosphate, providing the energy needed to change the myosin head angle to a 'cocked' position, ready for movement and potential energy storage.

The myosin heads detach from actin due to ATP binding, allowing for muscle contraction and relaxation cycles. The repeated binding and hydrolysis of ATP is crucial for the continuous cycling of myosin heads, enabling muscle contraction and relaxation through the power stroke mechanism.


Learn more about Muscle Contraction here:

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