Intake of oxygen and release of carbon dioxide by blood passing through
capillaries of alveoli is brought about by the following factors.
Difference in partial pressure of gases:
Diffusion of oxygen in and carbon dioxide out occurs
because of difference in partial pressure of these gases.
Thin layers of capillaries:
Within the rich network of capillaries surrounding the
alveoli, blood is distributed in extremely thin layers
Exposure to large alveolar surface:
Blood in capillaries is exposed to large alveolar
surface.
Separation by thin membranes:
Blood in the lungs is separated from the alveolar air by
extremely thin membranes of the capillaries and alveoli.
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