bone and skeletal system - principles

how much % bone mass recycle per week

6%

spongy bone replaced every

3-4 years

compact bone replaced every

10 years

bone contains how much of the body’s Ca2+

99%

how many bones in the human skeleton

206

functions of bone

support, protection, movement, mineral storage, blood cell formation

support function of bone

hard framework to support body, cradles soft organs

protection function

protects delicate organs from impact, movement damage

movement function

bones function as levers

mineral storage function

Ca2+, phosphate reservoir

blood cell formation function

marrow cavities are site of hematopoiesis

formation of long bones

2 heads and a shaft

long bones include

all limb bones except patella, ankle and wrist bones

flat bones