00:01
Okay, so looking at this question, we want to know what the driving force between for diffusion of oxygen across the cells of the respiratory organs is.
00:10
So we're going to have, if we imagine this to, we're going to have the capillary and then we're going to have red blood cells.
00:19
We're going to have air on this side and this is going to be our blood on this side.
00:24
So the factors affecting the diffusion of oxygen across the cells.
00:30
So the net movement or diffusion is going to be oxygen from the air to the blood and actually onto the heem protein of the red blood cell.
00:41
So this is going to be caused the, well, the first option a is the difference in partial pressure, difference in partial pressure of o2, i'm just going to call that p -o -2.
00:55
In the environment and in blood and that is going to be the correct answer so when we're talking about diffusion we always want to move along our concentration gradient so it's going to be in this case when we're talking about gases we're talking about partial pressures rather than concentrations but it's very similar to concentration in liquid so we have a higher partial pressure of o2 in the air and a lower partial pressure of o2 in the blood so we're going to get a net diffusion of of that o2 from the air into our blood.
01:32
And it's going to bind to those heem proteins.
01:34
The other options, b, humidity, that's really not going to affect it at all.
01:38
It may make it difficult harder for you to sweat and cool yourself down, but it's not going to affect the diffusion of oxygen.
01:45
So it's not going to be b.
01:47
C, the partial pressure of carbon dioxide in the blood...