why are lungs moist
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.