Please order the steps of myofilament movement. Myosin heads are "energized" by the presence of ADP + PO43-at the ATP binding site (energy is released as phosphate bond of ATP breaks). Once the active sites are exposed, the energized myosin heads hook into actin molecules forming cross-bridges = A new molecule of ATP binds to the myosin head, causing the cross bridge to detach from the actin strand. The myosin head will get re-energized. = The myosin head can bind again to the next active site. Using the stored energy, the attached myosin heads pivot toward the center of the sarcomere. The ADP & phosphate group are released from the myosin head Calcium (Ca+2) gates in the SR open, allowing Ca+2 to diffuse into the sarcoplasm. Calcium will bind to troponin (on the thin myofilament), causing it to change its shape. This then pulls tropomyosin away from the active sites of actin molecules. 12 13 14 15 16 17 18 19 20 21

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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.