1. The Cell Membrane Pages 60-61

2. The Cell Membrane

3. Vocabulary Phospholipid = lipid made of a phosphate group and two fatty acids

4. Vocabulary Polar = Hydrophilic, or "water-loving” – Soluble in water Nonpolar = Hydrophobic, or “water-fearing” – NOT soluble in water

5. Vocabulary Lipid bilayer = the basic structure of a membrane, composed of two layers of phospholipids

6. Passive Transport Passive transport = movement across the cell membrane that DOES NOT require energy – Examples = Diffusion and Osmosis

8. Passive Transport - Diffusion Diffusion = the movement of a substance from an area of HIGH concentration to LOW concentration. Note: the symbol for concentration is [ ].

9. Passive Transport - Diffusion Equilibrium = [ ] of a substance is EQUAL throughout a space

10. Passive Transport - Osmosis Osmosis = the diffusion of water across a semi-permeable membrane

11. Passive Transport - Osmosis 3 possibilities for direction of H 2 O movement: – Hypertonic solution = water moves OUT High [solute] in solution – Hypotonic solution = water moves IN Low [solute] in solution – Isotonic solution = NO NET WATER MOVEMENT Equal [solute] as [H 2 O]

12. Passive Transport - Osmosis