1. Active Transport

2. How do other molecules cross the cell membrane???
Selective Transport
Facilitated Diffusion (Another Passive Transport)
Active Transport
Protein Pumps
Endocytosis
Exocytosis

3. Video 3

4. Selective Transport There are two types of selective transport
Facilitated Diffusion
DOES NOT require the use of energy
Active Transport
DOES require the use of energy

5. Facilitated Diffusion
Glucose
molecules
High
Concentration
Cell
Membrane
Low
Concentration
Protein
channel

6. Facilitated Diffusion
Does facilitated diffusion require the use of energy?
NO!!!!
It uses a concentration gradient to transport molecules
The molecules move from an area of high concentration to an area of low concentration
Most SUGAR molecules pass across the cell membrane by this method of transport

7. Carrier Proteins Carry Molecules Across the Membrane
Good Example - transport of Glucose into the Cell

8. Active Transport Does active transport require the use of energy?
YES!!!
It uses ATP
Transports against the concentration gradient.
Low to High concentration
Examples: Sodium Potassium Pump, Endocytosis and Exocytosis

9. Active Transport
Molecule to
be carried
Molecule
being carried
Energy

10. Active Transport: Sodium Potassium Pump
Move Sodium out of the cell
Move Potassium into the cell
Uses energy (ATP)
Causes the protein to change shape
Move against a concentration gradient

11. Sodium Potassium Pump

12. Bulk Transport-Active
Endocytosis
Pinocytosis
Phagocytosis
Exocytosis

13. Video 5

14. Endocytosis
During ENDOCYTOSIS the Cell Membrane folds into a POUCH (Vescicle) that Encloses the Particles.

15. Two Types of Endocytosis: Pinocytosis and Phagocytosis
PINOCYTOSIS ---"CELL DRINKING“—Small Particles
PHAGOCYTOSIS---- "CELL EATING“-Large Particles

16. Treatments
Endocytosis can be used as a method to get a cell to take in an anti-cancer treatment.

17. Exocytosis EXOCYTOSIS is the opposite OR reverse of ENDOCYTOSIS.
EXOCYTOSIS, wastes and cell products leave the cell.

19. Specialized Transport Summary
Transport proteins
Facilitated diffusion - passage of molecules and ions with transport proteins across a membrane down the concentration gradient
Active transport - movement of a substance against its concentration gradient with the help of cellular energy