1. Cell Transport
Important because it allows cells to maintain homeostasis.

2. Double layer of phospholipids with proteins embedded Function –
Active Transport
Bulk
Transport
Structure –
Double layer of phospholipids with proteins embedded
Function –
Protection
Regulate movement of materials into and out of membrane
“selectively permeable”

3. Cell does not use energy H → L Types: Diffusion ex: O2 and CO2
Bulk
Transport
Cell does not use energy
H → L
Types:
Diffusion
ex: O2 and CO2
2. Osmosis
ex: H2O
3. Facilitated Diffusion
ex: glucose
Requires carrier protein molecule

4. Requires carrier protein molecule Ex: “pumps” Na – K pump
Active Transport
Bulk
Transport
Cell uses energy
L→ H
Requires carrier protein molecule
Ex: “pumps”
Na – K pump

5. Bulk Transport Molecules are too large Transported in vesicles Types:
Active Transport
Molecules are too large
Transported in vesicles
Types:
1. Exocytosis
Secretion of proteins
2. Endocytosis
Phagocytosis
“cell eating”
WBC eating bacteria
Ameoba feeding
Pinocytosis
“cell drinking”