Cell Membrane and Cell Transport. Molecular Structure of the Cell Membrane.

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Presentation transcript:

Cell Membrane and Cell Transport

Molecular Structure of the Cell Membrane

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

Profile: Plasma Membrane

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

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 )

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

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

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

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