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Muscular System

Muscular System. Muscle Facts. There are over 600 different muscles in the human body Body contains three muscle types: skeletal, cardiac, and smooth Skeletal muscles are voluntary muscles Cardiac and smooth muscles are involuntary. Functions of Muscles. Work with bones to create movement

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Muscular System

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  1. Muscular System

  2. Muscle Facts • There are over 600 different muscles in the human body • Body contains three muscle types: skeletal, cardiac, and smooth • Skeletal muscles are voluntary muscles • Cardiac and smooth muscles are involuntary

  3. Functions of Muscles • Work with bones to create movement • Gives body shape and support • Protection for vital organs • Vital bodily functions (heartbeat, digestion, excretion of waste, etc.) • Contractions create heat to maintain a normal body temperature

  4. Skeletal Muscles • Make up approx. 40% of body mass • Work in pairs • Named for shape, location, function • Connected to bones by tendons • Can grow in size with repeated resistance work • Can contract quickly, but get tired easily and must rest

  5. sterno-mastoid • Head movement • “yes” and “no”

  6. Trapezius (upper back, neck) • Pulls head and upper arms back • “yes” and “no” movement • Work with deltoids to lift arms

  7. Trapezius (developed)

  8. Pectorals (chest) • Move arms to center of body Press away

  9. Deltoid (shoulder cap) • Lifts arms to shoulder height • Named for Greek letter “D”

  10. Biceps • Flexes forearm; palm up

  11. Triceps • Extends forearm; • Fixes elbow when writing

  12. Brachioradialis • Flexes forearm, palm down

  13. Latissimusdorsi • Pulls arms down and back; give body “V” shape

  14. For real???????

  15. Abdominals Protects internal organs Helps hold body erect

  16. Gluteus maximus • Lifts leg backward • Helps hold body erect

  17. Hamstrings Flex knee to buttocks

  18. Quadriceps (quads) Four muscles groups Extends lower leg

  19. Sartorius • Longest muscle • Allows leg crossing

  20. Tibialis Pulls toes toward face

  21. Gastrocnemius (calf) Extends toes

  22. Achilles Tendon • Connects calf muscle to heel Named for Achilles of mythological fame

  23. Human Muscular Anatomy

  24. “I’ll be back!

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