When the second ATP is regenerated from ADP during the contraction cycle, what happens?  1.myosin heads attach  2.troponin rotates  3.tropomyosin covers active sites  4.cross bridges detach

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Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.