00:01
A smoker has damaged to several alveoli.
00:03
They can no longer function.
00:04
How does this affect gas exchange? so the alveoli are these little pockets with the lungs, and they have a very thin wall.
00:14
It's flat cells and a single cell thickness.
00:18
And then you have the capillaries, which also have walls made of a single cell thickness and a flat wall.
00:24
So there's a very, very tiny distance for diffusion.
00:27
Them.
00:28
So, blood flows along the capillary, and gas exchange can occur between them.
00:35
So you can have oxygen entering the blood and co2 leaving it.
00:39
But now there's alveola damage.
00:41
So how would this affect gas exchange? well, it means that the alveolas may not be able to properly expand, so air cannot get in...