Skeletal+System

 __The Skeletal System __  __By Grace Connor __  __The purpose of The Skeletal system __ The skeletal system’s purpose is to allow us to stand straight and not be a big blob on the ground. But that is not the only reason, for example the rib cage protects delicate organs, such as the heart and lungs. Also, the spinal column protects a nerve called the spinal cord. There is also the skull which protects our brain from fatal damage. Finally our bones work in unison with our muscles so we can bend move around.  __What Bones are made up of __ All 206 bones that are in a adult's body are made of layers, with each layer made of different material. The outer most layer which contains a thin membrane, nerves, and blood vessels. The second layer is a dense, firm bone called the compact bone. The compact bone has many tiny holes and pathways so nerve and blood vessels can carry out blood from the spongy bone. The spongy bone produces bone marrow, which is then carried from there to throughout the body. The bones that make bone marrow are the larger bones in the arms and legs.  __Diseases and problems occur the skeletal system __ The skeletal system can have many deceases or problems within it. For example, one of the problems of the skeletal system is arthritis. Arthritis is a joint disease which causes pain and stiffness when you move. It is when the joints are worn down and swollen. But it can be curable with medications. Another disease related to the skeletal system is rickets. Rickets is a disease where someone doesn’t get enough calcium, phosphate, or vitamin D. Rickets can cause the bones to become soft and they begin to bend in weird ways, under the weight of the body.



[] || || || Check your understanding 1. What are the names of two diseases that are related to the skeletal system? 2. How many bones are in an adult’s body? 3. What two organs does the rib cage protect? 4. What is made in the spongy bone? 5. What is arthritis?