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The Skeletal System by Thia

1/28/2019

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The Skeletal system is made of bones. Bones give protection, structure, movement and product blood cells bone marrow.
An adult has 206 bones in their body, there are two categories in the body there are axial bones that keep the body up right and there are the appendicular bones that help you move. The skull is also called the cranium it has only one large bone 
The ribcage protects the heart, lungs and liver. The ribs are in pairs, most of the ribcage is fixed to the vertebrae and sternum. At the end of the ribcage some bones are floating and only join to the vertebrae. There 32 vertebrae in the spine. Vertebrae run from the base of the cranium to the top of the pelvis. The hip bone is called the pelvis. 
Arms and legs are similar in structure. The arms have three bones; the top one is called the humerus, the two under are connected they’re called ulna and radius. The legs also have three bones the thigh bone is the longest in the body, called the femur, and the other two are also connected they are called fibula and tibia.
There are two different joints, one is called ball and socket. That joint lets you move a bone in every direction. The other joint is called a hinge joint that only lets the bone move in two ways.
It is easy to take care of your bones, you can drink milk and get other dairy products and get vitamin D from sunshine.


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