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13 Cards in this Set
- Front
- Back
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What is an osteoblast?
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Secretes osteoid
Not totally surrounded by bone matrix Derived from osteoprogenitor cell and cannot undergo mitosis |
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What are the 2 types of bone?
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1) Trabecular
2) Compact |
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What type of collagen is found in bone?
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Type I collagen for TENSILE strength
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What does bone serve as a reservoir for?
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calcium and phospate
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What are osteocytes?
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These are osteoblasts completely surrounded by self secreted bone matrix.
Found in Lacunae Communicate via GAP JXN within canaliculi NO MITOSIS |
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Ground substance is composed of?
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1) Proteoglycans with sides of GAGs
2) Glycoproteins 3) Hydroxyapatite 4) Water |
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What do osteoclasts look like?
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1) Reside within Howship's lacunae
2) Multinucleated |
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What is compact bone?
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1) No spaces visible to naked eye.
2) Forms the thick tube around long bones (Diaphysis) 3) Surrounds the medullary cavity 4) Thin layer also covers epiphysis |
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What do osteoclasts do?
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They resorb bone via lysosomal enzymes and collagenase
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Where is the periosteum?
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Outer layer
dense connective |
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Where are osteoclasts derived?
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From Monoctyes!
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What is trabecular bone?
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"Spongy bone"
1)Consists of delicate bars and sheets of bone, trabeculae. 2)Forms a spongy network. 3)Mainly found as ends of long bones (Epiphysis) |
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What is osteoid?
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Unmineralized bone
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