Sameer+and+Jeannot+notes+period+3

There are 206 bones in the human body. The skeleton allows movement, shap, support, produces red blood cells, and stores minerals and other materials until your body needs them. If we didn't have bones, we would be a big blob! Did you know when you were young you had over 300 bones. But when you reach adulthood you will only have 206? Now thats cool. Organs are protected by the skeletal system. The brain is surrounded by the cranium. Where muscles are connected to bones are tendons. When joints are where the two bones come together. The human skeleton is divided into two main parts 1. The **axial skeleton- contains bones that protect he organs of the neck, head, and trunk ** 2. The appendicular skeleton- holds the appendages to the axial skeleton.

The hip is made out of three bones, ilium, ichium, and pubis. When you are born, these bones are separated. As you grow older they grow. The main three bones of the leg are tibia, fibula, and femur. The tibia is the strongest bone in the LOWER PART of the skeleton. The fibula helps control the movement of the ankle.
 * The hips and legs-** The hip bones support our body's weight.

In between each vertebrae there is cartilage. The spine is very flexible and allows us to move. We have a curve in our spine so that we can balance our body. cartilage is attached to the sternum ( breastbone ). The ribcage protects your heart and lungs. The main part of the foot is the metacarpals and the phalanges. Phalanges are the toe bones. Also, we have arches on our foot. If we did not have arches in our foot we could not stand straight. The curve distributes the weight between the two sides.
 * The spine**- The spine is made of irregular bones called vertebrae.
 * The ribs**- Most people have 12 pairs of ribs. The ribs are connected to cartilage and the
 * The feet-** The foot has 26 bones. The bones in the toe are shorter and thicker than the hand.
 * The arm-**

The bones of the body have **four categories**: long ones, short bones, flat bones, and irregular bones. There are also **different tissue** in each bone. Compact, dense bone, spongey, or cancellous bone. Most joints have a connective joint called **cartilage**.