Explain gas exchange in alveoli.
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During gas exchange oxygen moves from the lungs to the bloodstream. ... This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli. Here you see red blood cells traveling through the capillaries.
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gas exchange in mammals occurred between this alveoli air and the blood in the alveolar capillaries
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