5. Myasthenia gravis is an autoimmune disease in which the body's immune cells attack and destroy the acetylcholine (Ach) receptors in the motor end plates of muscles in the shoulder, neck, and face. Why would Mr. Aletha experience a progressive weakening even if he tries to do more exercise? 6. How does exercise normally enhance your ability to contract muscles? What will change in a healthy muscle over a period of months if it is exercised regularly?

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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.