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29 Cards in this Set

  • Front
  • Back
what are the 5 functions of the skeleton?
1. support
2. storage of minerals
3. blood cell production
4. protection
5. leverage
how much calcium is deposited in bone?
98%
where are red and white blood cells and platelets produced?
red bone marrow
what parts of the skeleton function in protection?
skull, rib cage
what is the matrix of bone tissue made of?
1. collagen fibers -- flexibility
2. calcium salts -- strength
what are the 4 types of bone cells?
1. osteoprogenitor cells
2. osteoblasts
3. osteocytes
4. osteoclasts
what makes up hydroxyapatite crystals?... and what percentage weight of bone is it?
calcium phosphate + calcium hydroxide

2/3 % weight of bone
what is 1/3 of matrix of bone composed of??
collagen fibers
this makes up 2% of total bone tissue volume surrounded by matrix
osteocytes
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
layers of matrix
lamellae
- immature bone forming cell
- develops into osteocyte
- synthesize osteoid- organic components of matrix calcifies to form hard matrix
- produce new bone
osteoblast
producing new bone
osteogenesis
- stem cell whose divisions produce osteoblasts
- develop into osteoblasts
-in mesenchyme connective tissue
- play role in fracture repair
osteoprogenitor cells
-dissolve matrix by erosion
- multinucleated cell
- secretes acids through lysosomes
osteoclasts
osteoblast or osteoclast?

- secrete bony matrix to make bone strong
osteoblast
osteoblast or osteoclast?

dissolve bony matrix which releases calcium into the body fluids
osteoclast
osteoblast or osteoclast?

deposit calcium salts faster than other.. result is stronger and larger bones
osteoblast
osteoblast or osteoclast?

remove calcium salts faster than other... result is weaker bones
osteoclast
this type of bone is dense and solid
compact
this type of bone forms an open network
spongy, cancellous
basic functional unit of compact bone
osteon
this is arranged in concentric layers around central canals which contain vessels; mature bone cell that maintains the bone matrix
osteocytes
these canals connect central canals
perforating canals
cylindrical and parallel to long axis of bone ; form rings
a. concentric
b. interstitial
c. circumferential
lamellae
what are the layers of the osteon?
central canal, endosteum, concentric lamellae, collagen fiber orientation
spaces in lamellae that contain osteocytes
lacunae
what connect the lacunae -- [athways for nutrients and wastes
canaliculi
these canals are perpendicular to surface; carry blood vessels to osteons and medullary cavity
perforating canals