19) Based upon Figure 13.1, if end-diastolic volume is 100 mL at rest, what would stroke volume be if sympathetic nervous activity increased? 19) 20) Based upon Figure 13.1, if end-diastolic volume at rest is increased from 100 to 120 mL, 20) what will the new stroke volume be?

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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.