1. Homeostasis and Transport

2. Passive Transport
Molecules moving from a high to a low concentration; NO ENERGY REQUIRED

4. How Diffusion Works

5. Another Example of Diffusion

6. Examples
Sugar dissolving in water

7. Examples
Demonstration
in class

8. Examples
Oxygen and carbon dioxide into and out of our lungs

9. Questions 1.What do the molecules move across?
2.What happens when the concentrations become equal on both sides?
3.What is this called?

10. Osmosis Passive Transport No energy needed
Water molecules move from a high to a low concentration

11. Remember! Water moves to where there is more stuff! How Osmosis Works
Osmosis Jones

12. Hypertonic Solution
THINK-when you are HYPER in school, you have to LEAVE the room

13. Hypertonic

14. Hypertonic

15. Hypertonic

16. Hypotonic
THINK-"hypo hippo" the cell gets big like a hippo :)

17. Hypotonic

18. Hypotonic

19. Isotonic….Iso means???
when concentrations of solutes inside and outside the cell are equal

20. Isotonic

21. Some unicellular freshwater organisms require a lower concentration of water in the cytoplasm to function normally. A paramecia will use a contractile vacuole to remove water, but this requires energy

22. Plants and Turgor Pressure?

23. The plant cells on the left have turgor pressure, the ones on the right do not.

24. Hmmm..which is which?

26. Facilitated Diffusion
*Facilitate means to make easier, help
*Another type of passive transport
*No energy required

27. Molecules are too big to move across the membrane. hmmmm
*Molecules are too big to move across the membrane. hmmmm *Transport proteins are used like channel proteins and carrier proteins

28. Facilitated Diffusion Animation

29. Active Transport: the movement of a substance against its concentration gradient

30. *low to high concentration *REQUIRES ENERGY

31. Sodium-Potassium Pump

32. Other Types of Transport Endocytosis: cell bringing in large molecules
Other Types of Transport Endocytosis: cell bringing in large molecules Pinocytosis: cell drinking Phagocytosis: cell eating

33. Exocytosis: large substances exiting the cell

34. WHY ALL OF THIS? TO MAINTAIN HOMEOSTASIS!