QuestionAugust 3, 2025

What triggers tropomyosin to move? square What allows the myosin head to "cock" forward? square

What triggers tropomyosin to move? square What allows the myosin head to "cock" forward? square
What triggers tropomyosin to move?
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What allows the myosin head to "cock" forward?
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Solution
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Answer

Calcium ion binding to troponin triggers tropomyosin movement. ATP hydrolysis allows the myosin head to "cock" forward. Explanation 1. Identify the trigger for tropomyosin movement Tropomyosin moves when calcium ions bind to troponin, causing a conformational change that shifts tropomyosin away from actin's myosin-binding sites. 2. Determine what allows the myosin head to "cock" forward The myosin head cocks forward when ATP is hydrolyzed to ADP and inorganic phosphate (Pi), providing the energy needed for the conformational change.

Explanation

1. Identify the trigger for tropomyosin movement<br /> Tropomyosin moves when calcium ions bind to troponin, causing a conformational change that shifts tropomyosin away from actin's myosin-binding sites.<br /><br />2. Determine what allows the myosin head to "cock" forward<br /> The myosin head cocks forward when ATP is hydrolyzed to ADP and inorganic phosphate (Pi), providing the energy needed for the conformational change.
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