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well..i know that the cirulatory system and the respiratory system are dependent on each other because as you breath in, the air goes into your lungs where it passes through the complex alveoli system which connects to the heart. the heart then pumps the oxygen rich blood to all parts of the body. once that's done, the oxygen poor blood comes back to the heart, passes back through the alveoi exchange and then you breath out co2. and i think that the digestive system is related to the circulatory system also. this is because when the "food" gets down to the small intestine, the nutrients are sucked out of it and those nutrients are absorbed into the blood stream in which the heart pumps these nutrients to all parts of the body and the cells take nourishment off of it. but i cant really see how the digestive and the respiratory systems are interlated...

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13y ago

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