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b. Classes of levers

b. Classes of levers

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b. Classes of levers

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  1. b. Classes of levers Class I, II, and III – based on efficiency. See Holt, Page 87

  2. Class I

  3. Class II

  4. Class III

  5. B. Bone Development. (Reading pp 157-160)

  6. Bone formation = Ossification.

  7. Two types Intramembranous and Endochondral See – Lab 3 section “ossification”

  8. C. Injuries and disease. (Reading page 189)

  9. 1. The knee joint. a. anterior cruciate b. posterior cruciate c. lateral collateral d. medialcollateral

  10. 2. Dislocation = tearing of ligaments that keep bones in place (bone is forced out of position.)

  11. 3. Sprain = Damage to ligaments. (tearing or straining tendons or ligaments)

  12. 4. Fractures a. compound - bone sticks out through the skin b. simple - bone doesn't stick out through the skin

  13. Metatarsal fracture

  14. Clavicle Fracture

  15. 18 year old girl

  16. 12 year old boy

  17. 12 year old girl with buckle fracture of radius

  18. 5. Arthritis a. rheumatoid arthritis - inflammation of synovial membrane - articular hyaline cartilage destroyed

  19. 6. Rickets - from deficiency of vitamin D preventing ossification. The bones actually bend because cartilage still dominates. Vitamin D is needed for calcium and phosphorus absorption.

  20. Summary: What are the functions of the skeleton?

  21. 1) framework for support

  22. 2) attachment of skeletal muscles for movement

  23. 3) protection of vital organs

  24. 4) bone marrow is site of blood cell formation

  25. 5) bone stores minerals needed for metabolism