When Calcium Ion Binds to Troponin

question 22

Multiple Choice

When calcium ion binds to troponin,

• A) myosin shortens.
• B) tropomyosin moves into the groove between the helical actin strands.
• C) actin heads will bind to myosin.
• D) active sites on the myosin are exposed.
• E) muscle relaxation occurs.

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