1. Biological Membranes

2. Membranes

3. Membrane Proteins Transport Recognition Channels Pumps E- Transfer
Antigens, glycoproteins

4. Membrane Proteins Structural Proteins Receptors Joining Proteins
Attachment
Receptors
Signal Transduction
Joining Proteins
Enzymatic

5. Movement Across Membranes
Simple Diffusion
Random Movement of Molecules
Passive transport
Concentration Gradients

6. Movement Across Membranes
Osmosis
H2O only!
Solute Gradient
Hypertonic
Hypotonic
Isotonic

7. Osmosis & Cells

8. Movement Across Membranes
Facilitated Diffusion
Random Movement of Molecules
Passive transport
Concentration Gradients
Channel Proteins

9. Movement Across Membranes
Active Transport
Energy is required … ATP
Transport Proteins (pumps)
Movement AGAINST a concentration gradient.

10. Sodium-Potassium Pump

11. Short Homework:
How does “Cotransport” work & where in the body would you find such a phenomenon?
Be sure site your source(s)

12. Endocytosis/Exocytosis
Movement of very large molecules.
Vesicles form or merge with the cell membrane.
Secretion of large amounts of a particular substance.

13. Endocytosis Sometimes, this is “receptor-mediated” Formation
of a vesicle
Sometimes, this is “receptor-mediated”

14. Exocytosis
Vesicle already
formed

15. Movement Across Membranes
Simple Diffusion
Osmosis
Facilitated Diffusion (Passive Transport)
Active Transport
Endocytosis
Phagocytosis
Pinocytosis
Exocytosis