1. Section 1: Exchange with the Environment
CHAPTER 4 –
The Cell In Action
Section 1: Exchange with the Environment

3. TRANSPORT ACROSS THE CELL MEMBRANE — “LIPID BILAYER”

4. “FLUID MOSAIC MODEL”

5. PASSIVE TRANSPORT 
TAKING THE EASY ROAD

6. PASSIVE = REQUIRES NO ENERGY

7. PASSIVE TRANSPORT = DIFFUSION

8. DIFFUSION . . .

9. DIFUSION = OSMOSIS --- WATER !!!

10. OSMOSIS . . .

11. 1) Hypertonic --- salt solution = shrink & shrivel
2) Isotonic --- tap water
= normal cell
3) Hypotonic --- distilled water = swell & burst

13. “FACILITATED” DIFFUSION

14. carrier proteins are specific for the substances they transport

16. ACTIVE TRANSPORT = USES ENERGY

18. ACTIVE TRANSPORT . . .

20. phagocytosis & pinocytosis
time to eat & drink — a cell engulfing a substance is an example of active transport
phagocytosis & pinocytosis