Explain the physiological mechanisms that drive the changes in heart rate between conditions. 1) lying down and sitting up, regular breathing. 2) Between sitting up, regular breathing and immediately after exercise. 3) Between seated inhalation and exhalation.

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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.