MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is not a function of the myosin heads?
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Release energy through the breakdown of ATP
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Form cross-bridges with the active sites on actin molecules
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Produce tropomyosin to facilitate binding to actin molecules
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Bend and straighten during contraction due to the hinge attaching it to the rod portion
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Explanation:
Detailed explanation-1: -Tropomyosin blocks myosin binding sites on actin molecules, preventing cross-bridge formation, which prevents contraction in a muscle without nervous input. The protein complex troponin binds to tropomyosin, helping to position it on the actin molecule.
Detailed explanation-2: -Myosin heads contain two functional sites, one for actin and one for tropomyosin–This option is incorrect because myosin heads have one for actin and one for ATP.
Detailed explanation-3: -(b) The myosin head is attracted to actin, and myosin binds actin at its actin-binding site, forming the cross-bridge.
There is 1 question to complete.