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15 terms

Skeletal System

STUDY
PLAY
osteoclast
dissolve bone, put calcium into the blood
osteoblast
build bone, remove calcium and phosphates from the blood
osteocyte
mature cells find within compact bone, strengthens bone
diaphysis
shaft
epiphysis
end of bone (red marrow)
medullary cavity
yellow marrow
epiphyseal plate
between diaphysis and epiphysis (growth plate)
axial skeleton
head, neck, torso
appendicular skeleton
appendeges
functions of bones
support, movement, protection, mineral storage, blood cell synthesis (hematopoiesis)
bone growth
1. cartilage cells grow
2. periosteum forms (cartilage decomposes)
3. blood vessels invade and osteoblasts build spongy, then compact bone
4. osteoblasts become osteocytes when bony matrix surrounds them
5. epiphyseal plate remains btw. diaphysis and epiphysis, and epiphysis begins to ossify
dwarfism
growth hormone deficiency
giantism
abnormally large growth plate
osteoporosis
thinning of bones
rickets
softening of bone tissue