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Skeletal, Muscular and Integumentary Systems

Skeletal, Muscular and Integumentary Systems. Chapter 36. Skeleton. Endoskeleton Purpose(s): 1.support 2.protection 3.movement 4.Mineral “bank” 5.Blood cell formation. Structure. Osteon. Ossification of cartilage. Fixed/immovable/suture joints.

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Skeletal, Muscular and Integumentary Systems

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  1. Skeletal, Muscular and Integumentary Systems Chapter 36

  2. Skeleton • Endoskeleton Purpose(s): 1.support 2.protection 3.movement 4.Mineral “bank” 5.Blood cell formation

  3. Structure

  4. Osteon

  5. Ossification of cartilage

  6. Fixed/immovable/suture joints

  7. Detail of movable joint such as hinge at knee

  8. Muscles • Over 600 • 40% mass of human body • Greater percent of men’s body weight than women’s • Three different types: 1. cardiac 2. skeletal 3. smooth

  9. Detail of Muscle structure:

  10. Motor Units

  11. Animated Contraction • Action Potential reaches NMJ causing release of Acetycholine • Ach attaches to receptor on muscle fiber causing transmission of signal throughout sarcoplasmic reticulum • Calcium gets released from SR • Ca attaches to troponin moving tropomyosin out of active site on actin • The myosin head is now able to attach to actin forming a “cross-bridge” • The myosin head pivots causing contraction • ATP is used to release the myosing head and the process begins again muscles move

  12. Skeletal muscle function

  13. Skeletal Muscles work in pairs:

  14. Integumentary System Purpose(s) of Skin: • Barrier • Body temperature • Removes waste • Protects against U.V. radiation

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