ATP in muscle contraction is needed for A)attachment of myosin cross bridges to actin. B)release of myosin cross bridges from actin. C)pumping of Ca²⁺ back into the sarcoplasmic reticulum. D)All of the choices are correct.

Question

Quizplus · Accepted Answer

ATP is needed for all three processes listed in the answer choices, so the correct answer is D. ATP is needed for the attachment and release of myosin cross bridges from actin during muscle contraction, and it is also needed for the pumping of Ca2+ back into the sarcoplasmic reticulum, which is important for muscle relaxation.

ATP in Muscle Contraction Is Needed for