1. Notes: Passive Transport
Ch. 5 Pg

2. Cell Transport Molecules cross membrane in several ways
Some methods of transport require energy and some do not.
Depends molecules size, polarity, and concentration inside versus outside.

3. Cell Transport
Small molecules and larger hydrophobic molecules move through bilayer easily.
e.g. O2, CO2, H2O

4. Cell Transport
Ions, hydrophilic molecules, and large molecules do not move through the membrane on their own.
e.g. Na+, K+

5. Passive Transport
Movement across the membrane WITHOUT the use of energy

6. Concentration Gradient
Molecules have kinetic energy
Concentration Gradient: difference between high and low concentration
Molecules move “down” gradient without energy
Equilibrium - when all molecules are evenly spread out
Draw this!

7. Types of Passive Transport
1. Diffusion: Movement of molecules from high to low concentrations.

8. Types of Passive Transport
2. Facilitated Diffusion: Molecules too big to move across the membrane use carrier proteins
Ex. Glucose

9. Types of Passive Transport
3. Osmosis: diffusion of water across membrane
Water moves where there are more solutes.

10. Which way will the water move?

11. Types of Tonicity 1. Hypotonic
More solutes inside the cell, water moves in
The cell swells
Draw These
Animal Cell
Plant Cell

12. Hypertonic More solutes outside the cell, water moves out the cell
The cell shrinks
Plant Cell
Animal Cell
Draw these!

13. Isotonic Equal solutes inside and outside
Water moves in and out at the same rate
Cell stays the same
Animal Cell
Plant Cell
Draw These!