1. Double layer of phospholipids with proteins embedded
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”

2. 3. Facilitated Diffusion
Active Transport
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

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

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