CONCEPT APPLICATION 3. Imagine you are painting your bedroom at home. You get tired of repeatedly bending over to put more paint on your brush so you decide to just hold the paint bucket up with your other hand. It starts out going quite well, your back feels better, but you soon notice it is becoming harder and harder to hold the paint can steady. List the two things that are necessary to sustain a muscle contraction. Then choose the one (or is it both?) that is becoming an issue in this scenario and why. 4. Depletion of ATP is one explanation for muscle fatigue. Use your textbook or another source to explain additional factors that may contribute to muscle fatigue.

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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.