Red blood cells then take this carbon dioxide through a different system of blood vessels back to the heart. Once they reach the heart again, they are pumped over to the lungs, where they again come into contact with the alveoli. Here, the circulatory system and respiratory system interact once more when red blood cells release unneeded carbon dioxide back into the lungs as a W_S_ _ product. Answer the blank pls
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thanks
other answers done but that question not done yet
so help me
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