AS biology help

Debate and discussion of any biological questions not pertaining to a particular topic.

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Fishface
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AS biology help

Post by Fishface » Sun Dec 07, 2008 8:18 pm

Hi, i am stuck on a question in my biology homework. I am currently taking AS biology (just to help you see what level i am at)

So the question is... How does diffusion result in the alveoli having a moist surface

The only answer i can think of (well couple of answers) is that the alveoli have a moist tissue area to make for more efficent diffusion (but this doesn't say why it results in it having a moist surface area)

The only other idea i had was that diffusion is the net movement of moelcules from an area of higher concentration to an area of lower concentration and so maybe the surface area has a lower area of concentration and so the water molecules have diffused there and so the sufrace area becomes moist

Are any of these right or am i going off on a tangent here?

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mith
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Post by mith » Mon Dec 08, 2008 7:25 am

I think the moist surface is a requirement of diffusion since you cannot have air to liquid(blood) without some sort of wet interface or you would dry your blood out.
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