1. Cell Transport Notes

2. Cell Membrane- regulates what enters and leaves the cell

3. Lipid bilayer (phospholipids) make up the membrane with proteins embedded to help regulate what comes across the membrane

5. Macromolecules in Cell Membrane
Phospholipids- 2 layers with tails in between
Proteins
Carbohydrates

6. Proteins Act as channels to let molecules into and out of the cell
Or act as receptors that bind to signal molecules and cause a chemical reaction in the cell.

7. Why do we need protein channels?
The membrane is semi-permeable (It lets some molecules pass through but others cannot)
Things that can pass: small, non polar molecules
Things that can’t pass: large or charged molecules

8. Diffusion

9. Diffusion

10. Simple Diffusion
Equilibrium

11. Passive Transport- no energy required
Simple Diffusion - molecules move from high concentration to low concentration (down the slide)
Facilitated Diffusion- diffusion that uses a carrier protein

12. Osmosis
The diffusion of water through a semi-permeable membrane

13. SALT SUCKS

15. Facilitated Diffusion
Requires carrier protein
Does not need energy!!!!

16. Goes against the gradient and requires energy!!!
Active Transport
Goes against the gradient and requires energy!!!

17. Protein Pumps
Pumps materials AGAINST the gradient
UP THE SLIDE!!!!

18. Exocytosis- transport of very large materials outside the cell
Endocytosis- transport of very large materials into the cell (phagocytosis & pinocytosis)

19. Types of Endocytosis
Pinocytosis- “cell drinking”, absorbing liquids into
the cell
2) Phagocytosis- “cell eating”, absorbing food into
the cell