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When Calcium Ion Binds to Troponin

Question 45

Multiple Choice

When calcium ion binds to troponin,


A) tropomyosin moves into the groove between the helical actin strands.
B) active sites on the myosin are exposed.
C) troponin shifts to expose the active sites on actin.
D) muscle relaxation occurs.
E) myosin shortens.

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