Often a stroke (cerebrovascular accident, CA), impairs one side of the body, resulting in paralysis (hemiplegia). The paralysis can range in severity. In more severe cases, the patient often loses most of the function of their upper extremity and presents with glenohumeral (i.e., shoulder) subluxation (an incomplete or partial dislocation of a joint). a. Why is the primary reason this happens? b. What is likely to happen if left unaddressed?

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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.