Explain the relationship between concentration gradient and diffusion

Diffusion ( Read ) | Biology | CK Foundation

explain the relationship between concentration gradient and diffusion

Diffusion is simply the movement of any molecule from an area of higher concentration to an area of lower concentration, down a concentration gradient. Start studying Explain the relationship between diffusion and concentration gradients. Learn vocabulary, terms, and more with flashcards, games, and other. The concentration gradient, dC/dx, is the difference in molecule We can describe the rate of diffusion as directly proportional to the concentration At high solute concentrations, however, all the proteins are occupied with the diffusing molecules. Sugar transport in the red blood cell: Structure-activity relationships in.

Facilitated diffusion can increase the rate of diffusion of particular molecules at low concentrations.

What is the relationship between diffusion and concentration gradient?

However, the rate of facilitated diffusion levels off with increasing solute concentration. Additional increases in external solute concentration cannot increase the rate of diffusion once carrier proteins are saturated.

explain the relationship between concentration gradient and diffusion

Passive diffusion of solute into a cell is linearly related to the concentration of solute outside the cell. Carrier proteins increase the rate of diffusion by allowing more solute to enter the cell. Facilitated diffusion, however, approaches a maximum rate as the carrier proteins become saturated with solute.

What is the slope of this line? What do increases or decreases in the slope mean biologically? Now assume the concentration gradient is a constant. Look at the equation for facilitated diffusion and find the horizontal asymptote.

Try graphing this equation with different values for K. How does this change the concentration at which the carrier proteins are saturated? And we saw what happened.

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Since you have more of these particles here and they're all bouncing around in different directions randomly, you have a higher probability of things moving from the left to the right than from the right to the left.

You will have things move from the right to the left, but you're going to have more things, so you'll have a higher probability of things, moving from left to right.

explain the relationship between concentration gradient and diffusion

And so if you let some time pass, then they become more uniformly spread across a container. They have moved down their concentration gradient to make things more uniform. Now, what's interesting about this diagram is I've introduced a second particle, these big yellow particles.

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And we see that their concentration gradient is going in the other direction. So we have a low concentration, in fact we have no, on the left-hand, we have none of the yellow particles on the left-hand side, and we have a high concentration on the right-hand side. So their concentration gradient goes from right to left. And the whole point of this video is to show that each particle moves down its unique concentration gradient, assuming that it's not blocked in some way, it's going to move down its unique concentration gradient irrespective of what the other particles are going to do, for the most part.

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And so we see the yellow particles are going to move from high concentration, to low concentration. They're going to move, they're going to diffuse from right to left. And once again, there's no magic here.