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Does alveoli have close proximation with blood capillaries ???
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Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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The overall gas exchange surface area of the alveoli in an adult is about 60 m2. ... Blood capillaries are to be found in close proximity to the alveolar wall, so as to enable gas exchange to take place strictly by diffusion
Explanation:
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