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HUMAN BODY SYSTEM’S Fanni szemkeo THE SKELETAL SYSTEM The skeletal system is made up of your bone’s. All your bone’s are solid but your heart bone is hollow. Your bone’s help support you and protect you . When you were born you had over 300 bone’s in your body. As you grow your bone’s start to grow together so when you are a adult you have 206 bone’s in your body. The human hand has 27 bone’s and your face has 14. The longest bone in your body is your femur.[your thigh bone]. It and is one third of your height the smallest bone in your body is the stirrup in your ear which is one tenth of an inch. Even though a giraffes neck is longer then yours it has the same amount of bone’s. We have 230 moveable and semi-movable joint’s in are body. DIGESTIVE SYSTEM The digestive system is made up of the mouth the esophagus , the stomach and your intestines. When you are a grown up your intestines is at least 25 feet long but grown horse’s is 89 feet long. In all your life time your digestive system. The job of are digestive system is to turn the food you eat into something useful for your body. RESPIRATORY SYSTEM The respiratory system is made up of your nose the trachea and your lung’s. The job of the respiratory system is to help you breathe. If we didn’t have a respiratory system you would not be able to breathe. You breathe in 13 pint’s every minute. Frist you breathe in [about 20 times a minute]. Then it goes though your nasal passages were it is filtered, heated, moistened were it goes through the back of the throat . Then your m breathe goes through a windpipe which takes it the trout . After that it goes past the vocal cords to the lungs . Then it goes to smaller tubes that take it to bubbles called aleoli. The air is replaced with waste . And the journey is done. CIRCULATORY SYSTEM The circulatory system is made up of the heart the blood and the blood vessel’s . The job of the circulatory system is to take food and oxygen to your cell need’s. It take’s blood to your entire body. It also takes away waste’s. did you know that about 8 million blood cell’s die ever second and 8 million blood cell’s are born ever second. Red blood cell’s can live for 4 month’s. NERVOUS SYSTEM The nervous system is made up of the brain the spinal cord and the nerves. With out the nervous system you would not be able to feel , smell , taste , hear , laugh , smile , think or any thing . The nervous system send’s message’s to the rest of the body telling it what to do . It tells you to step and to breath. The nervous system controls your body. REFERENCE PAGE http://yucky.discovery.com/noflash/body/pg00 0008.html http://www.kidskonnect.com/content/view/33 7/27/ And the book : The human body system’s