Unit 6 Skeletal system: Bones and Joints
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15 terms
Terms | Definitions |
|---|---|
 Hematopoeisis | Blood cell formation. Not a function of bone tissue but a function of a whole bone. Occurs in the hollow space between bone tissue. |
| Calcium Reservoir | Bone Function. Stores calcium when too much in bloodstream, releases it when not enough in bloodstream. Controlled by hormone/endocrine system |
| Compact Bone | (dense bone) Dense bone on the outer surface that forms a sturdy protective layer. |
| Spongy Bone | (cancellous bone) forms trebeculae on the interior of the bone |
| "Physis" | "growth plate" or site of growth at the ends of long bones. |
| Epiphysis | ("epi-"=upon, "physis"=growth plate expanded area at the end of the bone, above the growth plate. |
| Epiphyseal Plate | growth plate |
| Metaphysis | where diaphysis and epiphysis meet |
| Diaphysis | the shaft or long portion of the bone |
| Hydroxyapatite | Inorganic portion of the Bone Matrix Calcium and Phosphorus in crystal form. Resists Compressive Forces |
| Osteoid | Organic portion of the Bone Matrix Mostly (90%) Type 1 Collagen Resist Tensile Forces |
| Articular Cartilage | Hyaline Cartilage that covers the epiphysis where one bone forms a joint w/ another. Reduces friction and absorbs shock |
| Osteoprogenitor Cells | -Mesenchymal stem cell, differentiates into an osteoblast -maintains population of bone cells (osteoblast cannot divide) -active during bone growth and are reactivated during fracture repair |
| Osteoblasts | -"blast"=to produce -produce and secrete components of bone matrix(osteoid) -produce TNAP--essential for mineralization (hydroxyapatite) |
| Osteocytes | -a mature osteoblast that as completely surrounded itself with bone matrix -reside in lacunae -cytoplasmic process housed in little tunnels, Canaliculi |
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