Draw and label the plasma membrane of a cell that is placed in a solution with concentrations of calcium ions and lactose that are greater than those on the inside of the cell. Use arrows to show the relevant gradients and the activity of the following membrane proteins: (1) a pump that exports protons; (2) a calcium channel; and (3) a lactose carrier.

Video transcript

Hello everyone. And in today's video we have the following problem. What type of particle movement is shown in the following illustration? So let's just analyze this illustration so that we can solve the problem. So here we can see the extra cellular space and here we can see the intracellular space. Let's write that down as we can see we have these glucose molecules that are moving from a higher concentration level to a lower concentration level in the intracellular space. Right. And they're doing it by using these carrier proteins. Now these carrier proteins are involved in one of two types of movement. They can either be involved in facilitated diffusion or they can be involved in active transport. Oswald. Now active transport occurs when we have molecules moved from low concentrations to high concentrations. So against the concentration gradient which requires energy, it requires a T. P. Because it's moving against the gradient. However, what we see here is that the molecules are moving from a higher concentration level to a lower concentration level. Since they're moving with the concentration gradient there performing diffusion and this is what we call facilitated diffusion because its diffusion performed through a protein which is the carrier that we see there. So that is going to be the final answer to our question. And I really hope this video helped