skeletal system Flashcards
functions of the skeletal system
1.) body support
2.) organ protection
3.) body movement
4.) mineral storage
5.) Blood cell production
provides firm yet flexible support to areas
cartilage
by weight, it is i normally about 35% organic and 65% inorganic material
bone matrix
strong bands of fibrous connective tissues that hold bones together
ligaments
inorganic materials in the bone primarily consist of ?
calcium phosphate crystal
organic materials in the bone primarily consist of ?
collagen and proteoglycans
responsible for the major functional characteristics of the bone
collagen and minerals
what are calcium phosphate crystal called
hydroxyapatite
if mineral in the bone is reduced, it results to what?
collagen becomes primary constituent and bone becomes overly flexible
the matrix ground substance consist of molecules called
proteoglycans
three types of bone cells
osteoclast
osteoblast
osteocytes
it means imperfect bone formation, a rare disorder caused by any one of the number of faulty genes that results in too little collagen production.
brittle bone disease/ osteogenesis imperfecta
are bone building cells
osteoblast
cells that have extensive endoplasmic reticulum and numerous ribosomes
osteoblast
osteoblast secrete high concentration of
Ca+ and phosphate ions
acts as templates that stimulate formation and mineralization of the matrix
hydroxyapatite
formation of new bone by osteoblast is called?
ossification
can occur multiple times during life; as a fetus, when growing larger and time in life when fracture is repaired
ossification
osteocytes account how much of the bone cells?
90-95%
osteoblast become what?
osteoclast
osteocytes has a life span of how many years?
up to 25 years
osteocytes cell bodies are housed with the bone matrix in spaces called?
lacunae
osteocyte cell extensions are housed in narrow, long spaces called
canaliculi
are bone destroying cells
osteoclasts