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Muscular Atrophy

Muscular Atrophy - The Muscular System Muscular Atrophy...

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The Muscular System Muscular Atrophy Individual muscle fibers decrease in size owing to a progressive loss of myofibrils (wasting away) * disuse atrophy- the flow of impulses to inactive muscle is greatly reduced. * denervation atrophy- complete atrophy when the nerve supply is cut. (6 mo.-2yrs. muscle 1/4 original size) * the muscle is eventually replaced by fibrous tissue (irreversible) Muscle Hypertrophy Increase in the size of muscle fibers secondary to increase in myofibrils, mitochondria, SR, nutrients, and energy supplying molecules. * muscle size controlled by growth hormone, testosterone, and exercise. Cardiac Muscle * involuntary * striated * have only a single centrally located nuclei * exhibit branching Consist of two separate networks:atria and ventricles * fibers in each network are connected to each other via intercalated disks (irregular transverse thickening of the sarcolemma). * the discs contain
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Muscular Atrophy - The Muscular System Muscular Atrophy...

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