How does exchange of repiratory gases takes place between blood and lungs in human beings.
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BY THE PROCESS OF DIFFUSION
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Gaseous Exchange in the Alveolus of Man
The capillaries lining the alveoli have impure blood which has low concentration of oxygen. So, the oxygen from the air easily diffuses into the blood through the thin barrier of the alveolus wall. Similarly since the concentration of carbon dioxide is quite high in the blood, the gas easily diffuses out into the alveolar space. From here, the air that has comparatively more concentration of carbon dioxide than the air that entered it, leaves the lungs.
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