Calcium binds directly to which muscle protein?
A)actin
B)myosin
C)troponin
D)tropomyosin
E)sarcoplasmic reticulum

Name: Calcium binds directly to which muscle protein? A)actin B)myosin C)troponin D)tropomyosin E)sarcoplasmic reticulum
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Question

Quizplus · Accepted Answer

Calcium binds directly to the protein troponin, which is located on the thin filaments of muscle cells. This binding causes a conformational change in troponin, allowing tropomyosin to shift and expose the myosin-binding sites on actin, initiating muscle contraction.

Calcium Binds Directly to Which Muscle Protein