Which of the following is true concerning the role of Calcium in the contraction ofmuscle-cells?A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum.B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum.C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum.D. All of the above are correct

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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.