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Major Muscles of the Human Body ( anterior and posterior view)

Major Muscles of the Human Body ( anterior and posterior view). Human Muscular System “anterior view”. quadriceps. biceps . deltoid. abdominals. sternocleidomastoid. pectorals (chest muscle). Human Muscular System “posterior view”. latissimus dorsi. gluteals. gastrocnemius.

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Major Muscles of the Human Body ( anterior and posterior view)

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  1. Major Muscles of the Human Body ( anterior and posterior view)

  2. Human Muscular System“anterior view” quadriceps biceps deltoid abdominals sternocleidomastoid pectorals (chest muscle)

  3. Human Muscular System“posterior view” latissimus dorsi gluteals gastrocnemius Achilles tendon trapezius Hamstring (biceps femori) triceps

  4. Skeletal Muscles • Long, thin, and striped (striated) • Continuous control (voluntary) • Tendons • Attached to bone at the periostium • multinucleated

  5. Smooth Muscle • Fibers are organized • Found inside the body • Works automatically • (can’t control your smooth muscle) • Necessary for survival

  6. Cardiac Muscle • Only in heart • Contain many mitochondria • By age 70 heart contracts 2.5 billion times (assume resting heart beat). • involuntary

  7. Muscular Disorders • Muscle “pull” or “strain” • Tearing a muscle fiber(s), followed by bleeding or swelling of muscle • Muscle “cramp” • Prolonged contraction of muscle, ion imbalance

  8. Cont. • Tendonitis • Swelling of the tendons due to sharp twist or pull, over use • Muscular Dystrophy • Inherited disease in which muscle cells break down, gradual weakening of muscles, lose ability to contract

  9. Quadriceps muscle(rectus femoris) Origin = “pelvis” - attachment to stationary bone Note the origin and insertion of this muscle belly tendon Insertion = “femur” - attachment to moveable bone

  10. Muscle Terms • Tendon • Long connective tissue cord • Actin and myosin • Muscle proteins • Origin • Attachment to stationary part of bone • Insertion • Attachment to moveable part of bone • Flexion • Movement that reduces a joint angle • Extension • A movement that increases a joint angle

  11. Movements of the body • Extension Flexion

  12. Muscle Belly to Sarcomere • Muscle Belly • Bundle of muscle fibers • Muscle Fiber (cell) • Bundle of myofibrils • Myofibril • Made up of units called sarcomeres • Sarcomere • Made up of muscle proteins • actin and myosin

  13. Antagonistic muscle pairs(one contracts while the other relaxes)

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