00:01
Alright, so i have a drawing of a cell membrane or the phospholipid bilayer down on the whiteboard down below, just to help us kind of visualize and answer the question.
00:11
So i'm just going to go through them one by one.
00:14
So first, the diffusion of water through a cell membrane.
00:18
So obviously we're talking h2o and how that is going to diffuse from one side to the other.
00:25
And that is going to happen through the process known as osmosis.
00:31
And osmosis is essentially just a fancy word for the diffusion of water, and that is going to happen from an area of high concentration to an area of lower concentration.
00:43
Second, the movement of substances through the cell membrane without the use of cellular energy.
00:49
So usually when we're talking about these, we're talking about very small particles.
00:53
So even something such as gases, such as o2, and the diffusion of them through the cell membrane.
01:01
And this is going to be known as passive transport.
01:10
And like i said, because it does not require any energy, they can simply just flow right through the membrane without any help.
01:17
Next, use to help substances enter or exit the cell membrane.
01:24
And these are most likely going to be your carrier proteins.
01:28
So carrier proteins are found throughout the phospholipid bilayer.
01:32
Some of them are going to be your integral proteins, so they're going to take up the whole kind of width of the cell membrane, and other ones are going to be more peripheral proteins, so just on one side.
01:50
But your phospholipid bilayer has many, many types of carrier proteins...