Experimenters can separate F-actin thin myofilaments frommyosin thick myofilaments. First they homogenize musclecells in a blender (to break cell membranes); then they place thehomogenate in a Ca2+-free “relaxing solution” that contains ATP.Explain why ATP must be present and Ca2+ ions must not bepresent in order to isolate thick and thin myofilaments from eachother.

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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.