12 The diagram below illustrates a small portion of a vein and its neighbouring skeletal - muscles. Valve skeletal muscles vein Valve Y Which of the following combinations shows the state of the muscle with the corresponding situations of valves X and Y? skeletal muscle valve X valve Y opened closed l. contraction closed/ contraction opened C relaxation opened opened D relaxation L closed A opened

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A:

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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.