1. Passive = not active (no energy) Transport = moving
5.1 Passive Transport pp
*Passive Transport = materials crossing the cell membrane with no energy needed
Passive = not active (no energy)
Transport = moving
*Diffusion and osmosis are passive transport
What other things are passive in how they get things done?

2. *equilibrium = net diffusion is the same in all directions
5.1 Passive Transport pp
*Diffusion = movement of molecules from an area of high concentration to an area of low concentration
High Low
Diffusion moves in all directions. Net diffusion is the overall change.
*equilibrium = net diffusion is the same in all directions
What other kinds of things go from high to low?

3. Membrane (cross section)
Fig. 7-11a
Molecules of dye
Membrane (cross section)
WATER
Net diffusion
Net diffusion
Equilibrium
(a) Diffusion of one solute

4. (b) Diffusion of two solutes
Fig. 7-11b
Net diffusion
Net diffusion
Equilibrium
Net diffusion
Net diffusion
Equilibrium
(b) Diffusion of two solutes

5. Osmosis = diffusion of water from high to low
5.1 Passive Transport pp
Osmosis = diffusion of water from high to low
Think of sugar in kool aid
Put a cell in kool aid

6. So more water goes into cell
5.1 Passive Transport pp
*Hypotonic = solution outside cell has lower concentration of dissolved particles than inside cell
Hypo = below, less
Tonic = solution
So more water goes into cell
OUT:
Draw a hypotonic solution with dots showing the particles.

7. So more water goes out of cell
5.1 Passive Transport pp
*Hypertonic = solution outside cell has higher concentration of dissolved particles than inside cell
Hyper = above, more
Tonic = solution
So more water goes out of cell
OUT:
Draw a hypertonic solution with dots showing the particles.

8. So more water goes in and out of cell at equal rate
5.1 Passive Transport pp
*isotonic = solution outside cell is equal in concentration of dissolved particles to that inside cell
iso = same
Tonic = solution
So more water goes in and out of cell at equal rate
OUT:
Draw an isotonic solution with dots showing the particles.

9. cell cell Hypotonic solution Isotonic solution Hypertonic solution H2O
Fig. 7-13
Hypotonic solution
Isotonic solution
Hypertonic solution
H2O
H2O
H2O
H2O
(a) Animal
cell
Lysed
Normal
Shriveled
H2O
H2O
H2O
H2O
(b) Plant
cell
Turgid (normal)
Flaccid
Plasmolyzed

10. …. = water = sugar (or any solute) Water flows high to low
5.1 Passive Transport pp
…. = water
= sugar (or any solute)
Water flows high to low

11. *Facilitated diffusion = passive transport that needs a door…
5.1 Passive Transport pp
*Facilitated diffusion = passive transport that needs a door…
Molecules that are too large to pass easily through the membrane can pass through carrier proteins
*Carrier proteins = proteins in the membrane that allow certain chemicals to pass

12. 5.1 Passive Transport pp

13. 5.1 Passive Transport pp