Which of the Following Most Accurately Describes the Effect of Decreasing

question 66

Multiple Choice

Which of the following most accurately describes the effect of decreasing Ca²⁺ concentration on sarcomere activity?

• A) troponin is deactivated and tropomyosin covers the actin binding site
• B) tropomyosin is deactivated and troponin covers the actin binding site
• C) myosin no longer hydrolyzes ATP and detaches from actin
• D) myosin no longer binds ATP and recocks into an upright position

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