bone and new markers Flashcards
1
Q
what is the purpose of bone?
A
stability
strength
movement
storage
2
Q
what is the structure of cortical bone?
A
Hard and is the outer layer of bone
3
Q
what is the structure of trabecular bone?
A
spongy and the inner layer of bone
4
Q
what is the composition of bone
A
it is made up of cells
- bone forming cells
- bone resorbing cells
- bone co-ordinating cells
Extracellular Organic matrix - 30% - mainly collagen (osteoid) - ground substance Inorganic components - 70% - hydroxyapatite (calcium and phosphate) - minerals (magnesium, sodium, potassium)
5
Q
what produces the extracellular matrix?
A
produced by osteoblasts
6
Q
what is the role of the osteoblasts?
A
- makes hormones
- communicates with other bone cells
- mineralise organic matrix
- makes osteoids
- become osteocytes
7
Q
what is the role of osteoclasts
A
to breakdown old bone
8
Q
how often is the adult skeleton replaced
A
every 10 years
