When a Muscle Fiber Is Relaxed,why Can't Myosin Bind to Actin

question 49

Multiple Choice

When a muscle fiber is relaxed,why can't myosin bind to actin?

• A) ATP is not present
• B) the myosin binding site on actin is blocked
• C) the myosin head is in the wrong shape for binding
• D) the actin is in the wrong orientation for myosin binding
• E) the myosin head is 180 degrees from its attachment configuration

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