Which point on the PV loop corresponds to the opening and closing, respectively of the aortic valve? 200- 180 160 140 120 D 100 80 60 40 20 B 20 40 60 80 100 120 140 160 180 200 Left ventricular Volume (mL) A. A and B, respectively B. A and C, respectively C. C and B, respectively D. D and B, respectively E. C and E, respectively Left Ventricular Pressure (mm Hg)

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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.