1. Cell Membrane and Cell Transport

2. Molecular Structure of the Cell Membrane

3. Phospholipid Molecule  Hydrophillic head (water loving)  Hydrophobic tail (water hating)

4. Profile: Plasma Membrane

6. Factors Affecting Permeability 1. Molecular size of particles 2. Electrical charge of particles 3. Solubility of substance in water molecules

7. Molecular size The cell membrane is generally permeable to small molecules: i. carbon dioxide (CO 2 ) ii. water (H 2 O) iii. glucose (C 6 H 12 O 6 )

8. 2. Electrical Charge Electrical charge on the atom or molecule affects the movement of particles. Positive Negative Na + Cl -

9. Solubility of substance in water  Refer to Chemistry Periodic Table for Solubility of various monatomic and polyatomic atoms/molecules

10. DIFFUSION - Conditions for the movement of particles  Concentration of solutes (i.e. sugar) is either HIGHER or LOWER.

24. Assignment Define the following words:  Passive transport  Brownian motion  Diffusion  Osmosis  Concentration gradient 7. Equilibrium 8. Homeostasis 9. Hypo/iso/hypertonic 10. Active transport 11. Pinocytosis 12. Phagocytosis