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Description The skeletal system is made up of bones, __joints__ and muscles. Bones have a outer shell called the outer membrane. Inside is bone marrow and spongy bone and compact bone. Compact bone has blood vessels and canals.

There are 275 bones in the human body. A baby has more bones than a adult when it is first born because the babies bones will grow together to make bigger bones. A adult has 206 bones.

The smallest bones in your body are in your ear. The smallest bone is your Stapes. It is in the middle of your ear. The largest bone in your body is your __Femur__ or your thigh bone. It is also the longest bone in your body.

A joint is a place where two bones come together. Joints also allow your bones to move in different ways. There are different kinds of joints. 4 are hinge joint, pivot joint, gliding joint and the ball and socket joint. Think of it like this, hinge joints look like a hinge, ball and socket joints look like a ball in a socket. F unction The three main functions of the skeletal system are: Protection of the bodies organs, supports the body and provides attachment points for muscles. The skeletal system is basically your skeleton. The main functions of your skeletal system are critical for survival because without protection of your organs they could take a strong hit and your organs will start to fail. You cant live without two lungs. Without your skeleton you would be like a big blob on the ground. And without attachment points for your joints you would not be able to move your joints. Word Bank Joint: A place where two bones come together Femur: A large bone in your thigh By gabby