1. Active and Passive Transport

2. This is what we will study today:

3. Passive Transport Does not require energy
Includes diffusion and osmosis
Moves from a high concentration to a low concentration

4. Molecules move from high concentration to lower concentration
Diffusion
Molecules move from high concentration to lower concentration

5. Osmosis
The diffusion of water across a semi permeable membrane (such as a cell membrane)

6. Osmosis
The water will move from a higher concentration of water to a lower concentration of water

7. Osmosis
The flow of water will change depending on the solution (isotonic, hypertonic, hypotonic)

8. Osmosis
An isotonic solution is a solution where the concentration of solutes (dissolved substances) is the same inside and outside the cell.

9. Water flows into and out of the cell at equal rates.
Isotonic Solution
Water flows into and out of the cell at equal rates.
Arrows show flow of water

10. These are cells in isotonic solution

11. These are cells in isotonic solution

12. These are cells in isotonic solution

13. Osmosis
In a hypertonic solution, there is a higher concentration of water inside of the cell than outside of the cell.
Arrows show flow of water

14. The water flows out of the cell, to where there is less water.
Hypertonic Solution
The water flows out of the cell, to where there is less water.
Arrows show flow of water

15. These are cells in hypertonic solution

16. These are cells in hypertonic solution

18. Osmosis
In a hypotonic solution, there is a lower concentration of water inside of the cell than outside of the cell.
Arrows show flow of water

19. The water flows into the cell. Eventually it may rupture.
Hypotonic Solution
The water flows into the cell. Eventually it may rupture.
Arrows show flow of water

20. These are cells in hypotonic solution

21. These are cells in hypotonic solution

23. Active Transport Requires energy
Is the movement of molecules across a membrane
Usually moves from a low concentration to a high concentration

24. Plants use active transport to remove nutrients from the soil
Examples:
Plants use active transport to remove nutrients from the soil
Animals use active transport to pump sodium out of cells, and potassium into cells.

25. Active Transport
Some things are too big to pass through the cell membrane by diffusion (passive transport).
These things need energy (active transport) to get through the cell membrane because they are too big.
Examples: glucose (sugar) and proteins.

26. Review- what solutions are these cells in?

27. Review- what solutions are these cells in?

28. Review- what solutions are these cells in?

29. Review