Which statement below best describes the role of Ca ++ in muscle contraction

saraalalwane

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2022-09-20

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Which statement below best describes the role of Ca ++ in muscle contraction?

Ca ++ binds to troponin, thereby changing its shape to expose the binding site.
Ca ++ causes ADP and inorganic phosphate to detach from the myosin crossbridge.
Ca ++ attaches to the myosin head, causing it to disengage from its binding site.
Ca ++ crosses the sarcolemma from the axon terminal which allows the action potential to propagate along the sarcolemma.

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saraalalwane

2022-09-20

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A: Ca attaches to troponin causing a shape change which shifts the attached tropomyosin away from binding sites of actin.

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