Quizzes & Puzzles6 mins ago
respiratory
explain gaseous exchange in the lungs?
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air is inhaled into the lungs, so there is plenty of oxygen in the lungs. gas exchange happens in the alveoli (tiny sacs in lungs). As there is a higher concentration of oxygen in the lungs than in the surounding blood vessels (capillaries), most of the oxygen molecules will passively diffuse into the blood. There is a higher concentration of carbon dioxide in the blood than in the alveoli, so CO2 passively diffuses into the alveoli, so it can be exhaled.
air is inhaled into the lungs, so there is plenty of oxygen in the lungs. gas exchange happens in the alveoli (tiny sacs in lungs). As there is a higher concentration of oxygen in the lungs than in the surounding blood vessels (capillaries), most of the oxygen molecules will passively diffuse into the blood. There is a higher concentration of carbon dioxide in the blood than in the alveoli, so CO2 passively diffuses into the alveoli, so it can be exhaled.