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the respiratory system breathes in air/oxygen through your nose and breathes out carbon dioxide (your nose hairs processes the air and makes boogers) . Oxygen can also come through the mouth to do the same process. then it goes towards the throat but goes in the wind pipe. the from there it goes into your lungs and your diaphragm expands which also makes your chest expand. then you breathe out it goes out of your lungs back though the wind pipe and out your nose.

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when you eat food it goes through your mouth and down your esophagus. then it goes into your stomach where it goes into the small intestine before that it goes through the stuff it can't digest and it goes into the large intestine. the pancreas and the liver are connected and the liver sends liquids to the pancreas so it can digest.

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the muscular system the cardiac muscle is what helps the heart pump. the smooth muscle are also in spots around your eyes they are what actually let you move your eyes and if you didn't have that muscle you couldn't move your eyes. your skeletal muscle is one of many muscles you can flex also your tendons are what are between or behind you knee cap and between your elbows are what let them move.

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the circulatory system is all of the veins in your body. like the arteries and regular veins and other veins. the circulatory system is when the heart pumps blood into your veins.

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the Integumentary system is what makes your hair grow and what gives it color. what actually gives your hair color is a pigment called melanin. and certain amounts will give you a certain color of hair. this is what also allows your nails to grow.