B classes of levers
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b. Classes of levers. Class I, II, and III – based on efficiency. See Holt, Page 87. Class I. Class II. Class III. B. Bone Development. (Reading pp 157-160) . Bone formation = Ossification. . Two types. Intramembranous and Endochondral See – Lab 3 section “ossification”.

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b. Classes of levers

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B classes of levers

b. Classes of levers

Class I, II, and III – based on efficiency.

See Holt, Page 87


Class i

Class I


Class ii

Class II


Class iii

Class III


B bone development

B. Bone Development.

(Reading pp 157-160)


B classes of levers

Bone formation = Ossification.


Two types

Two types

Intramembranous and Endochondral

See – Lab 3 section “ossification”


C injuries and disease

C. Injuries and disease.

(Reading page 189)


B classes of levers

1. The knee joint.

a. anterior cruciate

b. posterior cruciate

c. lateral collateral

d. medialcollateral


B classes of levers

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


B classes of levers

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


B classes of levers

4. Fractures

a. compound - bone sticks out through the skin

b. simple - bone doesn't stick out through the skin


B classes of levers

Metatarsal fracture


B classes of levers

Clavicle Fracture


18 year old girl

18 year old girl


12 year old boy

12 year old boy


12 year old girl with buckle fracture of radius

12 year old girl with buckle fracture of radius


B classes of levers

5. Arthritis

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


B classes of levers

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.


Summary

Summary:

What are the functions of the skeleton?


B classes of levers

1) framework for support


B classes of levers

2) attachment of skeletal muscles for movement


B classes of levers

3) protection of vital organs


B classes of levers

4) bone marrow is site of blood cell formation


B classes of levers

5) bone stores minerals needed for metabolism


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