Questions: 15. Now look at the right side of the model. Is calcium present here: a. To what molecule did it bind? b. What changed about the troponin molecule after it bound calcium? c. What effect did this change in troponin have on tropomyosin? d. Is the myosin binding site of actin exposed when calcium is present? 16. In the space below, write a grammatically correct sentence (in English) that explains the role of troponin, tropomyosin, and calcium in muscle cell contraction.

15. Now look at the right side of the model. Is calcium present here: a. To what molecule did it bind? b. What changed about the troponin molecule after it bound calcium? c. What effect did this change in troponin have on tropomyosin? d. Is the myosin binding site of actin exposed when calcium is present? 16. In the space below, write a grammatically correct sentence (in English) that explains the role of troponin, tropomyosin, and calcium in muscle cell contraction.
Transcript text: 15. Now look at the right side of the model. Is calcium present here: a. To what molecule did it bind? b. What changed about the troponin molecule after it bound calcium? c. What effect did this change in troponin have on tropomyosin? d. Is the myosin binding site of actin exposed when calcium is present? 16. In the space below, write a grammatically correct sentence (in English) that explains the role of troponin, tropomyosin, and calcium in muscle cell contraction.
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Solution

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a. Calcium binds to the troponin molecule.

b. After calcium binds to troponin, the troponin molecule undergoes a conformational change.

c. This change in troponin causes tropomyosin to move away from the myosin binding sites on actin.

d. Yes, the myosin binding site of actin is exposed when calcium is present.

  1. In muscle cell contraction, calcium binds to troponin, causing a conformational change that moves tropomyosin away from the myosin binding sites on actin, thereby allowing myosin to bind to actin and initiate contraction.
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