The diagram shows Tasha's arm as she bends her am to pull back her tennis rackel Contracted muscle When Tasha straightens her am to hit the tennis ball, what happens to the musces In her arm" O A. The top muscle contracts, and the lower muscle relaxes. O B. The top muscle relaxes, and the lower muscle contracts. C. The top muscle contracts, and the lower muscle contracts. O D. The top muscle relaxes, and the lower muscle relaxes.

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A:

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.