Structure of a bone

musculoskeltal system

Describe the compact bone

• made of bone cells called osteoblast

• found in the disphysis of the bone (shaft)

• consists of calcium and protein

what in the function of the compact bone

gives bone its strength

describe the spongy bone

• found in the epiphysis

• contains hollows filled with red marrow (porous)

function of spongy bone

produces blood cells (because it contains red marrow that makes blood components)

describe the medullary cavity

contains yellow fat rich marrow (inactive)

function of yellow marrow

• converts to red marrow when needed

• stores fat

what does cartilage consist of?

• flexible fibrous protein called collagen

• lacks nerves and blood vessels

function of cartilage

• acts as a shock absorber (protects bones)

• helps reduces friction

how does a bone grow?

• osteoblasts - bone forming cells

• increase in length is due to the growth plate made of cartilage (between the epiphysis and diaphysis)

• cartilage is formed and then turned to bone (ossified)

what is an osteoclast? (bone development)

large bone digesting cells (in the medullary cavity)

• prevent bones from getting to heavy

• deposit the calcium from the bone into the blood vessels

what is bone renewal?

is bones become stressed by PHYSICAL ACTIVITY they become stronger

• osteoblasts are stimulated

factors that affect bone development

• physical activity

• diet

• growth hormones