Which of the following statements about resting heartrate is true?   A it is highest in elderly individuals because they have the weakest hearts   B low blood calcium and low blood potassium both increase heartrate   C the resting heartrate for a fetus is slightly more than double that of a normal adult   D an above normal resting heart rate is referred to as bradycardia

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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.