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The Circulatory System: Heart

Transporting materials between cells is necessary for multicellular organisms. Like many animals, the heart plays a key role in the human circulatory system, which transports blood around the body.

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The Lungs

Your cells require oxygen for respiration, so you need to get it from the air into your bloodstream. You must also expel carbon dioxide from your bloodstream. All of this occurs in your lungs. Your lungs are forced to take in and expel air when you breathe.

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