What is the function of alveoli?, Alveoli are tiny air sacs in the lungs where gas exchange occurs. Oxygen moves into the blood, and carbon dioxide moves from the blood into the lungs to be breathed out., Which blood vessels carry blood away from the heart?, Arteries carry blood away from the heart., How do the respiratory and circulatory systems work together?, The respiratory system brings oxygen into the lungs and removes carbon dioxide. The circulatory system transports oxygen from the lungs to body cells and carries carbon dioxide back to the lungs to be breathed out.

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