PRESENTATION OUTLINE
functions of THE SKELETAL SYSTEM
- The skeleton gives shape & support to your body
- bones protect your internal organs
- muscles are attached to bone and help them move
- blood cells are formed in the center of bones
- calcium & phosphorous are stored inside the bones and make bones hard
Bone Formation
Bones in your body were not always hard. When you were born your bones were made of cartilage.
Gradually the cartilage broke down and was replaced by bone. Bone forming cells called osteoblasts deposit calcium and phosphorous in bones, making bone tissue hard. Another type of bone cell is called osteoclasts, which breaks down the bone. When osteoclasts break down bone, they release calcium and phosphorous into the bloodstream.
Joints
All motions are possible because your skeleton has joints. Any place where two or more bones come together is a joint. The bones are held in place at these joints by tough bands or tissue called ligaments. Muscles move bones by moving joints.
Importance of the skeletal system
The skeletal system gives shape and support to your body. Your bones protect your internal organs. Major muscles are attached to a bone and helps the bone move. Blood cells are formed in the center of many bones in soft tissue called bone marrow. And major quantities of calcium and phosphorous compounds are stored in the skeleton for later use. The calcium and phosphorous makes your bones hard.
