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17 terms

Bones (Osseous tissue)

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Bone tissue cells
osteogenic cells (osteoprogenitors), osteoblast, osteocytes and osteoclast
Osteogenic cells (osteoprogenitors)
produce new cells; stem cells →osteoblast
Osteoblast
create more bone mass and make bone (matrix)→osteocytes
Osteocytes
mature bonecells →bone maintance
Osteoclast
bone resorption (breakdown)→different origin than other bone cells; release calcium
Matrix
calcium salt and collagen (protein)
Bones
compact (dense) and spongy (cancellous)
Two types of spongy bones
periosteum-surround "outside" of bone and endosteum-surround "inside" of bone
Compact (dense) bone basic unit (building block)
osteon
Compact (dense) bone central canal
blood vessels; respond to nerve
Spongy (cancellous) bone basic unit (building block)
trabecula
Spongy (cancellous) bone central canal
nerve tissue
Bone development & growth
intramembranous ossificaiton and endochondral ossification
Intramembranous ossification
messenchyme → bone (produce bone); occur relatively EARLY in development
Endochondral ossification
cartilage→bone; occurs relatively LATE in development
What bone is used for
Calcium homeostasis
Endochondral ossification happens until you stop growing around age _____or ____
20 or 22