In the image, the cricketer powerfully
swings the bat, a movement that requires rapid and coordinated muscle
contraction. Which
sequence best describes the microscopic events enabling muscle contraction?

Question

Accepted Answer

Calcium binds troponin, shifting tropomyosin to expose actin. Myosin releases ADP and Pi, triggering the power stroke.

Answer

Calcium exposes active sites on thick filaments. ATP binding to myosin initiates the power stroke.

Answer

Action potential at T-tubules releases calcium, which binds to thick filaments to change shape and shorten the sarcomere.

Answer

Calcium directly activates myosin, which binds actin. ATP hydrolysis then drives the power stroke.

Crowdly

In the image, the cricketer powerfully swings the bat, a movement that req...

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