During exercise—as compared with rest—what are the aspects ofblood O2 transport that can be modified to increase O2 deliveryto the exercising muscles? Based on the information discussed inthis chapter, how do squids differ from vertebrates in the specificways in which they increase O2 delivery?

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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.