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The Skeletal System

The skeletal system is an important organ system. It is in charge of supporting the structure of the body.  The skeletal system includes all the bones in your body and many other important organs. Together with the muscular system, the skeletal system allows you to move all the different parts of your body


For a minute try to imagine what a human body would look like without any bones.  It would be a pile of skin and organs that wouldn’t be able to move or stand upright.  So, how do we stand upright?  Luckily, we have a skeletal system!  The skeletal system includes all the important bones, ligaments, and tendons that work together with your muscles to help you move
Another interesting function of the skeletal system is blood cell production. There is a squishy material called bone marrow inside your bones. Bone marrow makes all of the blood cells that are used in the cardiovascular system.
Illustration of dancing skeletons.
The bones that make up your skeleton help you move – like this dancing skeleton. 


Every organ system is made up of one or more organs. An organ is a group of cells in the body that all work together to perform a certain function.  Within the skeletal system, there are 4 major organs: bones, cartilage, ligaments, and tendons
The adult human body has 206 bones. However, when you are a child, you have more bones, but as you get older some of the bones grow together to become one. Bones are important for supporting the structure of your body.  They are also important in protecting important organs. 
Cartilage is special tissue in the body that supports your joints and other parts of the body, like your ear. If you feel your ear you will notice that it isn’t hard like a bone.  Instead its kind of squishy. This is because it is made out of cartilage, not bone. 
Ligaments are special tissues that connect bones to other bones. Without ligaments, the bones at the top of your arm wouldn’t be connected to the bones at the bottom of your arm. 
A closeup view of a knee joint.

Ligaments, like these ones in the knee, connect bones to other bones.

Tendons are special tissues that connect bones to muscles. Without tendons, your muscles wouldn’t be able to move the different parts of your body. 
Image of the Achilles Tendon.

Tendons, like the Achilles Tendon in the ankle, connect bones to muscles.

Other Great Resources 

Written by: Leah Tolby.