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The alveoli are the sites of gas exchange in the lungs. They are tiny air sacks sometimes described as being cauliflower-shaped. Oxygen diffuses across the lining of the alveoli and blood capillaries into and into red blood cells. Carbon dioxide diffuses from the blood to the alveoli.
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The exchange take place in the million of alveoli in the lungs and the capillaries that envelop them. gas exchange in the delivery of oxygen from the lungs to the bloodstream and the elimination of carbon dioxide from the bloodstream to lungs. it occour in the lungs between the alveoli.
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