Which of the following is true concerning the role of Calcium in the contraction ofmuscle-cells?A. Smooth muscle cells contract in response to an extracellular inward-Calcium-current.B. Skeletal muscle cells contract in response to an extracellular inward-Calcium-current.C. Striated muscle cells contract in response to an extracellular inward-Calcium-current.D. No type of muscle cell requires an extracellular inward-Calcium current for normalcontractile-function

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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.