Blood capillaries and alveoli are covered with epithelium . Why?
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Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. ... This allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood
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because epithelium primarily functions as a diffusion boundary...and blood capillaries as well as alveoli depend on diffusion to transport their contents...
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