Describe how and why the diffusion is needed to more accuratelydescribe ion mobility....

Describe in your own words the process of
diffusion.

So if we're trying to find out the differences between diffusion facilitated diffusion, active transport and those site Oh, sis. So starting with diffusion fusion is, um Onley efficient of your small distances on requires a high surface area volume ratio. Just celebrated diffusion. It is a form of past the transport In what, remembering protein assistant moving polar, sell you down the concentration. Korean active transport involves the movement of substances across the membrane against its concentration radiant. And this uses a carrier protein and 80 p. Well, I'm just a toe says, is when a cell membrane swallows or engulfs fluids and marks molecules to put them into the cell.

So for this question that we're doing is we're comparing contrasting facilitated diffusion versus active transport on what we're really talking about. Here is just what transport is in general now. If we think about what transport is, there's really two types, so there's really active and passive, And what I mean by active is that it requires input of energy. So requires energy. And with passive transport, we need no energy input to make it happen. So how do we tell if something's going to happen passively or actively? Well, the way that things diffuse or transport follows a predictable syriza venz. So imagine we have this container here, which has this little barrier in the middle that molecules can get through. And let's say we have lots and lots and lots of these blue molecules over here on the left hand side. So we would describe this as high concentration, right, because there's a bunch of blue molecules, so they're highly concentrated now on the right hands. I we only have three blue molecules, so it's a low concentration, and what things like to do normally is they like to move from high to low concentration, which you may have also heard this described as moving down the concentration greedy in so things like to move down concentration, radiant. So what this means in the context of our example is that the blue molecules are going to move to the right because they wanted equal number of blue molecules on both sides. So they're trying to level the playing field. They reach a set of equilibrium, and they're going to move down or concentration, greedy in. So this is it happens without energy input. So moving down the concentration ingredient, this is passive transport. Now, if I wanted to for some reason, get all the blue molecules on one side, that would require pulling these three molecules 123 over to the highly concentrated side. And that would be going against the concentration greedy in which would require input of energy. If we're gonna force it into an area where there's not a lot of space, we need to input energy to get it there cause it's unfavourable, so input energy. So this is active transport, so active transport goes against the concentration ingredient. Passive transfer goes with the concentration ingredient, so now it's comparing address what the differences between the facilitated diffusion, facilitated diffusion and active transport. Well, when you see the word diffusion, that is a big key that we're talking about, something passive. So passive equals diffusion. We're diffusion equals passive. Either way, now, what we see here is the word active. So that's a pretty dear dead giveaway that this is active or equals energy required. Now, remember, when we has seen its passive no energy input required. So in facilitated diffusion, this is not simple diffusion whereby ah, particle just crosses that little imaginary barrier that I draw on the other side. Maybe, let's just say that this is our new container and we now have something that looks like this. This is our new imaginary barrier. But our molecules are this big, so they're not gonna fit through those tiny spaces, even though they're clearly wanting to get to the other side. Great, cause we have high concentration here and low concentration here. So how do we get them across? Well, but facilitated diffusion. What we have are we have these little proteins called channel proteins, worked some type of transport protein where they fill a little space, and they make it possible, so that way the molecule can pass through. So if you imagine that that was Harlow, these can pass through to the other side. So that is one type of transport protein, and that would be called the Channel protein. But you can just think of it as kind of like a tunnel to the other side. And then the other type of protein that you might see in terms of facilitated diffusion is something called a carrier property. And what carrier proteins dio is there open on one side. So they have a nice little spot for this to fit into. So this blue molecule would come and it would fit in there, and then it would close around the blue molecule, so I'll draw it out stepwise. So one, 23 So this is what's happening at the carrier protein. So if this is our barrier, so the first thing that's gonna happen as we have it open on the one side and are blue molecule comes right on him, then the red protein carrier protein is gonna seal around the blue molecule, and then what it does is it opens to the other side. So that way, the blue molecule gets released into the other side of the membrane, so it goes in and then out. So it basically just flip flops. So what opens on one side of the membrane closes known, opens on the other side, the membrane, and that is passive transport because it is going down its concentration greedy A now with active transport. What this means is whatever molecule you're trying to transport, let's just use this green. So let's just say you have these green molecules here and you have to green molecules on the other side. If this were passive transport, the proteins or whatever these read molecules are would go from left to right, so this would be passive. But this isn't what we're talking about. Someone drawn extra well we want is we want it to be active transport. So they're gonna go from right to left, meaning they're going against their concentration. Greedy int so active transport against concentration, radiant. So that means lo too high. So, overall, the rial main difference between diffusion and actor transport is the direction that molecules air flowing. If things were feeling down their concentration ingredient, then it's defused a diffusion and it's passive. But if they're filling up their concentration ingredient, meaning going from a low constitution to a high concentration and that's going to require the input of some energy and that would be active transport.

Disgusting diffusion. We need to consider that there are several different properties. They're going to be influencing the diffusion of molecules across the membrane. So when we're considering passive diffusion, where molecules will be moving down the concentration Grady int, such as we have here in the diagram if we consider temperature as a factor affecting our diffusion rate when we have instances of increased temperature has seen here on the top, you're going to have temperature increasing the energy of molecules. We're going to see that as a result, increasing the movement of these molecules so increased temperature will increase our diffusion rate. We'll see molecules and warmer temperature water moving rapidly. Um, put across our concentration radiant. However, instances of whole temperature cold temperatures going to decrease the energy of our molecules. So we're going to have decreased movement of these molecules, and as a result, we're going tohave a decrease diffusion rates

So diffusion occurs when, uh when molecules move from an area of high concentration to an area of low concentration usually happens in a solution such as a water based solution. So ah, an example that I've got for you is steeping tea. So I don't know if any of you have. They are tea drinkers. But if we if we drive, we've got this mug of tea and this is a see through mug so so that we can see what's going on here. But, ah, if we have this mug of tea and let's say that we put our tea bag in it. So at the beginning, we initially have. All of our T molecules are concentrated high concentration inside the tea bag, all the molecules that give the t its flavor and its color and what happens is over time they're going to start seeping out into the water. It starts out fairly quickly, depending on the temperature of the water. But you started getting ah, high concentration of tea like a medium tie concentration of of T molecules right around the tea bag. And then naturally, those molecules air going to spread out until eventually you can see that the entire cup Ah, is full of tea and And if you mix it well, then those team molecules are evenly distributed. So starts out where we have a high concentration here in here, the tea bag and ends. It moves toward where we have a low concentration here at the edge.