1. Movement Across Membranes (1.3)
Pre – AP Biology
Movement Across Membranes
(1.3)

2. Movement across the membrane Gases go through a wet phospholipid bi-layer. Ions & water go through proteins

3. Diffusion High concentration  low concentration

4. Osmosis Water moves Hypo  Hyper

5. Water movement and cells

6. Water Potential (Ψ) High potential  low potential

7. Facilitated diffusion See the use of protein help?

8. Active Transport using a Na/K pump See the use of ATP(energy molecule)?

9. Proton pump needing ATP low concentration  high concentration

10. Exocytosis

11. Endocytosis Phagocytosis & Pinocytosis