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The muscular system is an organ system that consists of skeletal, smooth, and cardiac muscle. This system is composed of specialized cells called muscle fibers.

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Skeletal muscles are resonsible for overall body mobility. These muscles are straited because most of them are attached to bones to produce movement. The straitions indicate that we have voluntary control.

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The role of smooth muscles is to create movement within internal organs, blood vessels, and glandular ducts. These muscles are not straited meaning it is involuntary. Instead, the movements are controlled by the autonomic nervous system.

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Cardiac muscle is an involuntary, straited muscle that can only be found in the heart. This muscle contracts without being stimulated by the nervous system.

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This disorder is characterized by progressive weakness and degeneration of muscle fibers. As skeletal muscle cells deteriorate, fat replaces those cells. There is no cure, but medications and therapy can help manage the symptoms.

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This is a chronic autoimmune disorder resulting in the weakness of skeletal muscles. The most common cause of MG is a defect in the transmission of impulses from nerve to muscle cell. MG mainly affects voluntary muscles such as around the eyes, mouth, and throat. There is no cure, but symptoms can be controlled.

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Fibromyalgia is a disorder characterized by widespread pain along with fatigue and sleeping problems. Those with this disorder have an increased sensitivity to pain. The cause is unknown and there is no cure, but medications and therapy to control symptoms.

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A muscle biopsy is the removal of a piece of muscle tissue for examination. A needle is inserted into the muscle and when removed, a small piece comes out with it. This test can be used to identify inherited muscle disorders, metabolic defects of the muscle, and inflammatory diseases of the muscle.

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An MRI is a medical imaging test that produces detailed images of organs, soft tissues, muscles, and blood vessels. This imaging test can detect muscle abnormalities including volume, swelling, and lesions.

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A myoplasty is the surgical repair of a muscle. Often, part of a muscle is partly detached and used to repair deformaties of the muscle.

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This surgery moves a working muscle and tendon to replace a non-working muscle and tendon. The goal is to restore movement and function to the muscle.

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1. The three types of muscle cells are smooth, skeletal, and ___ ?

2. What does the suffix -plasty in myoplasty mean?

3. True/False - smooth muscles are voluntary

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The main purpose of the muscular system is to produce movement. Muscules are also responsible for maintaining posture, stabilizing joints, and generating heat.