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12 Cards in this Set
- Front
- Back
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Functions of Bone and Skeletal System (6) |
Support -- provides structural framework Protection of internal organs Assistance in movement -- skeletal muscle attachments Mineral Homeostasis Blood cell production -- red marrow: red & white blood cells Triglyceride storage -- yellow bone marrow |
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Four types of Bones |
Long Bones Short Bones Flat Bones Irregular Bones |
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What occurs when placed under stress |
bone tissue becomes stronger through increased deposition of mineral salts and collagen fibers |
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This is due to the absence of mechanical stress (seen in people who have lack of exercise - i.e. bed ridden patients, astronaut's bones) |
weakens bone... loss of minerals and collagen fibers |
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Mechanical stress |
when a structure is strained to the limit (i.e. if you keep bending and straightening something it stresses it stresses it and and all structures can fail if stressed too much.) |
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List the steps of endochondral ossification |
1. development of cartilage model 2. growth of model (by cell division) 3. development of primary ossification center (occurs in diaphysis -- bone tissue replaces most of the cartilage) 4. bone breakdown by osteoclasts = development of marrow cavity 5. secondary ossification centers occurs 6. formation of articular cartilage and epiphyseal plate -- consists of hyaline cartilage |
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Where does secondary ossification occur? |
in the epiphyses of the bone |
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During endochondral ossification... |
bone gradually replaces a cartilage model |
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Initial bone formation in an embryo and fetus |
inframembranous and endochondral ossification |
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What is formed by inframembranous ossification? |
- flat bones of the skull - facial bones - mandible - medial part of clavicle |
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the formation of bone within mesenchyme arranged in sheetlike layers that resemble membranes |
Inframembranous ossification |
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Osteoporotic bone (happens with immobility and in menopause) |
bone that has thinned out |
