1. The Plasma Membrane Structure and function

2. The phospholipid bilayer  2 layers of phospholipid molecules –“head” is hydrophylic –“tail” is hydrophobic

3. Semipermeable!  Semipermeable refers to the fact that the membrane only allows certain particles to pass through.

4. Diffusion  Particles naturally will spread out to fill a space evenly.

5. Osmosis  Water will naturally move from hypotonic to hypertonic.  This will continue until isotonicity is reached.

6. Passive Processes  “Passive” refers to not requiring energy. –Only possible when moving particles in the direction of natural diffusion. (With the Concentration Gradient)

7.  Proteins imbedded in the membrane form channels allowing larger particles through

8. Active Transport  Proteins imbedded in the membrane force partices against the concentration gradient

9. Other functions of the membrane  Glycoproteins serve as identification.  Proteins serve as anchors for the cytoskeleton.  Proteins bind cells to one another

10. Functions Review

11. Complete Picture of the Membrane