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Muscular System Greidys Peraza …

- - - - Mostly boys, ages 2–7 clumsiness and frequent falls. Cause: Defective dystrophin gene, leading to muscle cell damage and muscle loss.
    - - Cause: Unknown possibly trauma, sleep problems, or abnormal pain processing.Symptoms: Tender points and stiffness.Treatment: Physical therapy and massage.
    - - Cause: Autoimmune disorder blocking nerve signals to muscles.
      - Symptoms: Muscle weakness and shortness of breath.
      - Treatment: Medication/no cure.
    - - Cause: Brain injury or abnormality.
      - Symptoms: Muscle weakness, tightness, and spastic paralysis.
      - Treatment: Medication and physical therapy no cure.
    - - Cause: Autoimmune disease or infection.
      - Symptoms: Muscle weakness, swelling, and tenderness.
      - Treatment: Medication, antibiotics, and reducing inflammation.
    - - Contraction occurs when myosin binds to actin, forming cross bridges
      - Myosin pulls actin toward the center of the sarcomere, shortening the muscle fiber.
      - Z discs move closer together, I bands and H zones shorten, and A bands stay the same length.