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Calcium Must Be Present for Muscle Contraction to Occur

Question 36

Multiple Choice

Calcium must be present for muscle contraction to occur. Calcium


A) fits in the binding sites of actin and attracts the myosin heads
B) fits in the binding sites of actin and attracts the myosin tails
C) binds troponin, causing tropomyosin to shift and expose actin binding sites
D) binds tropomyosin, causing troponin to shift and expose actin binding sites
E) serves as a cofactor in the catalytic subunit of myosin, encouraging ATP hydrolysis

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