1. Movement Across Membranes-Summarized
Getting Materials In & Out of Cells

2. TASK 1 Membrane Model Phospholipids: Major part of cell membranes
Structure:
2 Hydrophobic tails
Hydrophilic head
In a bilayer

3. TASK 2 Simple Diffusion
Molecules that diffuse: small & polar…water, CO2, and O2

4. TASK 3 Facilitated Diffusion
No extra energy needed
Diffusion with the help of protein channels!

5. TASK 4 Active Transport Still requires the help of protein channels!
EXTRA energy needed
During
Before
After

6. TASK 5 Bulk Transport ENDOCYTOSIS Membrane folds in on itself.
energy needed
Membrane folds in on itself.
Inside of cell 6

7. TASK 5 Bulk Transport EXOCYTOSIS Membrane folds in on itself.
energy needed
Membrane folds in on itself.