1. Framework- gives us the structure to support and shape
us as we are.
2. Protects our vital organs.
3. Allows attatchment of muscles so that we can move.
4. Production of blood cells. Red marrow produces 2 billion r.b.c. per second,
w.b.c. are produced slower. As an adult the production occurs in the end of the femur, pelvic bone and sternum.
5. Storage of calcium and phosphorus. These elements make the bone hard
Structure: Bones are different shapes
and designs depending on its job and location. Processes are bumps and grooves that allow ligaments and muscles to connect
and allow blood and nerve vessels to pass through.
is living while inside of a living body. It is made of cells that need nutrients and uses energy.
bone development- ossification: osteoblasts build up bone. osteoclasts break down
bone tissue and release calcium and r.b.c.
*periosteum- thin membraned sheeth that covers the bone. contains blood vessels and nutrients.
bone- hard shaft of long bones, very dense. contains bone cells, blood vessels and protein.
*spongy bone- at the ends
of long bones, open porous honeycomb like. light weight.
*marrow- soft inner part of the bone that contains blood vessels and
fat cells. red marrow produces blood cells and yellow stores lipid.
Ligaments: strong elastic connective tissue that holds bone to bone.
tissue that is flexible. it has no blood velles or minerals. it is at the ends of bones and absorbs shock and reduces friction.
it works as a cushion. it can wear away and is called arthritis.