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Report Abuse. that's because it is a respiratory surface and theoretically, must be moist. the actual reason is so that the oxygen can be dissolved in that moisture and absorbed, thus gaseous exchange.trixc Â· 7 years ago. Thumbs up.xygen is what the lungs are trying to absorb, but at the same time the lungs function as something of a barrier to solids. The membranes of the epithelial and endothelial cells don't pose a barrier to the movement of this oxygen and the carbon dioxide that needs to be exhaled.
Answered by The Community. Making the world better, one answer at a time. The epithelium and blood vessels in the nasal cavity serve to warm and moisturize the air as a person breathes it in. This is to prevent the delicate membranes of the alveoli from being damaged by cold dry air.