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Introduction to the Muscles

I. Introduction to the Muscles. Muscles of the Skull and Neck. Muscle Facts. A person has about 600 muscles in their body Those muscles account for about ½ of a person’s body weight The heart beats about 3 billion times in the average person’s lifetime. Functions of Muscles.

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Introduction to the Muscles

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  1. I Introduction to the Muscles

  2. Muscles of the Skull and Neck

  3. Muscle Facts • A person has about 600 muscles in their body • Those muscles account for about ½ of a person’s body weight • The heart beats about 3 billion times in the average person’s lifetime

  4. Functions of Muscles • Maintain Body Posture • Stabilize Joints • Produce Movement • Generate Heat

  5. Muscles • Two Kinds of Muscles • Voluntary • You control the muscle when you want it to move • Involuntary • Muscles move without you telling it to

  6. 3 Types of Muscles • Skeletal Muscles • Also called striated muscles • Muscles of the arms, legs, etc. • Voluntary muscles

  7. Skeletal Muscle

  8. Types of Muscles • Smooth Muscles • Muscles of internal organs • Involuntary muscles

  9. Smooth Muscle

  10. Types of Muscles • Cardiac Muscles • Muscles of the heart • Involuntary muscles

  11. Cardiac Muscles

  12. Three Types of Muscle

  13. Skeletal Muscles • Slow-Twitch Muscles • Also called red muscles, because of dense number of capillaries • Carries a lot of oxygen, making them extremely useful for aerobic exercise • Fast-Twitch Muscles • Called white muscles • Used primarily in anaerobic exercise

  14. Muscles During Exercise • Slow-Twitch Muscles • Long, low levels of exercise • Consume a mixture of fats, protein, and carbohydrates • Consume large amounts of oxygen and produces little lactic acid

  15. Muscles During Exercise • Fast-Twitch Muscles • Relies primarily on ATP and glucose for fuel • Consumes very little oxygen, fat, or protein and produces large amounts of lactic acid • Can not be sustained as long as aerobic exercise

  16. Quiz • Name 1 of the 4 functions of muscle. • Name a second function of muscle. • What is the kind of muscle that works without you having to tell it to? • What is the type of muscle that is found in the heart? • What is type of skeletal muscle used in aerobic exercise?

  17. Quiz Answers • Name 1 of the 4 functions of muscle. • Name a second function of muscle. • Maintain Body Posture • Stabilize Joints • Produce Movement • Generate Heat • What is the kind of muscle that works without you having to tell it to? • Involuntary • What is the type of muscle that is found in the heart? • Cardiac • What is type of skeletal muscle used in aerobic exercise? • Slow-Twitch Muscle

  18. Structure of the Muscle • Belly • Body of the muscle • Tendons • Ends of the muscles that attach to the bone • Muscles are arranged in pairs • One muscle bends the joint, another straightens • Flexors • Extensors

  19. Tendons vs Ligaments • Short, bands of fibrous tissues • Connect muscle to bone and allow a joint to move • Short, bands of fibrous tissues • Connect bone to bone and form a joint

  20. Muscle Attachment • Origin • End of the muscle that is attached to the bone to form stationary attachment • Acts as an anchoring point • Insertion • The point where the muscle is attached • The movable bone

  21. Muscles of the Skull • Temporalis – anchored at the temple • Masseter – anchored at the cheek bone • These muscles move thelower jaw

  22. Muscles of the Neck • Sternocleidomastoid (Neck Cord) • Anchored to the clavicle and top of the sternum • Turns and lifts the head • Sternomastoid

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