By: William McBride
The Cranium or Skull
Skeletal System Facts
The skeletal system is the organ system that supports and protects the body and allows it to move. Its other jobs include storing minerals and producing red blood cells. A humans skeleton is inside the body, so it is called endoskeleton.
Bones are alive! Bones are hard organs made of minerals and connective tissue. They have blood vessels which supply nutrients and nerves which signal pain. The body of a new born baby has about 300 bones, but the average adult has only 206 bones. As a child grows, some bones fuse together. Bones provide support for your body and make it possible for you to sit or stand up upright.
The tough, flexible strand of connective tissue that holds bones together is a ligament. Ligaments allow movement, and are found at the end of bones. Some ligaments, such as the ones on your vertebrae, prevent too much movement of bones.
Cartilage is a strong, flexible, and smooth connective tissue found at the end of bones. It allows bones to move smoothly across each other. The tip of your nose and your ears are soft and bendy because they contain only cartilage. Cartilage does not contain blood vessels.