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Muscular System

Muscular System . BY Ricardo Castrejon Max Calderon Lizette Chapa. Introduction. The Muscular System is a system of 600+ muscles that produces movement, protects internal organs, produces body heat, and maintains posture. Kinds of Muscle.

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Muscular System

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  1. Muscular System BY Ricardo Castrejon Max Calderon Lizette Chapa

  2. Introduction • The Muscular System is a system of 600+ muscles that produces movement, protects internal organs, produces body heat, and maintains posture.

  3. Kinds of Muscle • Cardiac Muscle- forms the walls of the heart and contracts to circulate blood. • Visceral or Smooth Muscle- found in the internal organs, contract to cause movement. Ex. Digestive and Respiratory organs, blood vessels, and eyes. • Skeletal Muscle- attached to bones and causes body movement.

  4. Voluntary vs. Involuntary • Voluntary Muscles- muscles a person has control over. Ex. Skeletal Muscles • Involuntary Muscles- Muscles that function without conscious thought or control. Ex. Cardiac and Smooth Muscle.

  5. Muscle Functions • Produces Movement • Protects Internal Organs • Produces Body Heat and Energy • Maintains Posture

  6. Muscle Attachment • Skeletal Muscle attach to bones in different ways. • Tendons- strong, tough connective-tissue cords. • EX. Calf muscle to the heel by Achilles tendon. • Fascia- tough, sheet like, membrane that covers and protects the tissue. • EX. Muscles in trunk and back surrounded by lumbodorsal fascia.

  7. Muscle Attachment • When a muscle attaches to a bone, the end that does NOT move is the origin. • When a muscle attaches the end that moves when the muscle contracts is the insertion.

  8. Muscle Movements • Adduction- moving toward the midline. • Abduction- away from the midline. • Flexion- bending a body part. • Extension- straightening a body part. • Rotation- turning a body part around its axis. • Circumduction- moving in a circle at a joint.

  9. Muscular Diseases • Muscular dystrophy- group of inherited diseases that lead to chronic, progressive muscle atrophy. Usually appears early in childhood; most types result in total disability and early death. • Myasthenia gravis- chronic condition, where nerve impulses are not properly transmitted to the muscles. Leads to the progressive weakness and paralysis.

  10. Muscular Diseases • Muscle spasms- sudden painful, involuntary muscle contractions. May result from overexertion, low electrolyte levels, or poor circulation.

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