Now straighten it. Put your hand on your knee. Today we are going to talk about body joints. Our skeleton is made up of many bones. The places where these bones join together are called joints.
Joints are places where two bones come together.
Without joints, our skeleton would have no flexibility. There are four types of joints. The knee and elbow need to allow the bones to move back and forth like the hinges on a door. They need to be able to sort of roll. Look at the poster of the human body.