When Calcium Ion Binds to Troponin

question 4

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)actin heads will bind to myosin.
• D)muscle relaxation occurs.
• E)myosin shortens.

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