1. Diffusion, Osmosis, and Cell Membrane
- Diffusion: substances spreading from a high concentration to a low concentration
- Osmosis: water moving across a membrane from a high concentration to a low concentration
-the cell membrane is semi-permeable, which means that some things can go through and other things can’t
-the cell membrane is also known as the “plasma” membrane
-the cell membrane is mostly made up of phospholipids

2. Diffusion, Osmosis, and Cell Membrane
-a phospholipid is made up of two parts: a hydrophilic head (water-loving) and a hydrophobic (water-fearing) tail
phosphate
group
glycerol
hydrophilic
polar head
hydrophobic
nonpolar
head
fatty acid chain

3. Diffusion, Osmosis, and Cell Membrane
(This is what the cell membrane looks like when viewed from the side)
-The cell membrane contains phospholipids, lipids (cholesterol), carbohydrates, and proteins

4. Diffusion, Osmosis, and Cell Membrane
-The cell membrane is also known as the “fluid mosaic model” because all the parts in the membrane are free to move around
-the cell membrane allows water and nonpolar molecules through, but other, larger molecules cannot pass through
-there are two kinds of proteins embedded within the cell membrane:

5. Diffusion, Osmosis, and Cell Membrane
-integral (or transmembrane): go through the
entire membrane
-peripheral: proteins found only on the
surface of the membrane
-these proteins can help to allow certain things to move in and out of the membrane
-there are also proteins that contain markers (which can be made of carbohydrates) that help to identify the cell

6. Diffusion and Osmosis Comics
Write a three panel cartoon for both diffusion and osmosis. You can do it in any way that you want, but make sure you include explanations of what is happening in each panel.
Diffusion:
Osmosis: