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29 Cards in this Set
- Front
- Back
what are the 5 functions of the skeleton?
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1. support
2. storage of minerals 3. blood cell production 4. protection 5. leverage |
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how much calcium is deposited in bone?
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98%
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where are red and white blood cells and platelets produced?
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red bone marrow
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what parts of the skeleton function in protection?
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skull, rib cage
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what is the matrix of bone tissue made of?
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1. collagen fibers -- flexibility
2. calcium salts -- strength |
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what are the 4 types of bone cells?
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1. osteoprogenitor cells
2. osteoblasts 3. osteocytes 4. osteoclasts |
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what makes up hydroxyapatite crystals?... and what percentage weight of bone is it?
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calcium phosphate + calcium hydroxide
2/3 % weight of bone |
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what is 1/3 of matrix of bone composed of??
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collagen fibers
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this makes up 2% of total bone tissue volume surrounded by matrix
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osteocytes
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this type of cell is
- mature bone cells - completely surrounded by hard bone matrix - maintain and monitor both protein and mineral content of matrix - found in lacunae - interconnected by canaliculi |
osteocytes
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layers of matrix
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lamellae
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- immature bone forming cell
- develops into osteocyte - synthesize osteoid- organic components of matrix calcifies to form hard matrix - produce new bone |
osteoblast
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producing new bone
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osteogenesis
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- stem cell whose divisions produce osteoblasts
- develop into osteoblasts -in mesenchyme connective tissue - play role in fracture repair |
osteoprogenitor cells
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-dissolve matrix by erosion
- multinucleated cell - secretes acids through lysosomes |
osteoclasts
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osteoblast or osteoclast?
- secrete bony matrix to make bone strong |
osteoblast
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osteoblast or osteoclast?
dissolve bony matrix which releases calcium into the body fluids |
osteoclast
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osteoblast or osteoclast?
deposit calcium salts faster than other.. result is stronger and larger bones |
osteoblast
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osteoblast or osteoclast?
remove calcium salts faster than other... result is weaker bones |
osteoclast
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this type of bone is dense and solid
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compact
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this type of bone forms an open network
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spongy, cancellous
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basic functional unit of compact bone
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osteon
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this is arranged in concentric layers around central canals which contain vessels; mature bone cell that maintains the bone matrix
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osteocytes
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these canals connect central canals
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perforating canals
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cylindrical and parallel to long axis of bone ; form rings
a. concentric b. interstitial c. circumferential |
lamellae
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what are the layers of the osteon?
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central canal, endosteum, concentric lamellae, collagen fiber orientation
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spaces in lamellae that contain osteocytes
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lacunae
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what connect the lacunae -- [athways for nutrients and wastes
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canaliculi
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these canals are perpendicular to surface; carry blood vessels to osteons and medullary cavity
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perforating canals
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