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Firedancer20 Firedancer20
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12 years ago
a. the head detaches from actin

b. the head attaches to troponin

c. Ca2+ reacts with the ATP

d. actin and myosin both shorten
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wrote...
12 years ago
A is True
In fact when ATP binds to myosin head the affinity of myosin head to actin active side reduces.then it detaches
wrote...
12 years ago
Your answer is A
ATP binds myosin, allowing it to release actin and be in the weak binding state (a lack of ATP makes this step impossible, resulting in the rigor state characteristic of rigor mortis). The myosin then hydrolyzes the ATP and uses the energy to move into the "cocked back" conformation. In general, evidence (predicted and in vivo) indicates that each skeletal muscle myosin head moves 10-12 nm each power stroke, however there is also evidence (in vitro) of variations (smaller and larger) that appear specific to the myosin isoform.
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