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Cell Transport II: Diffusion and Osmosis

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Presentation on theme: "Cell Transport II: Diffusion and Osmosis"— Presentation transcript:

1 Cell Transport II: Diffusion and Osmosis
Christopherson

2 Homeostasis The ability of an organism to adjust its internal environment to keep it stable.

3 Where are WE? Cell Transport is fueled by the need of the cell to maintain homeostasis Tissue Organism

4 Diffusion Movement of particles from an high concentration to a low concentration; reach homeostasis High Low

5 What is concentration? The amount of a substance
High concentration means there is a lot present

6 External examples of diffusion
a. Food coloring and water

7

8 High concentration (amount of substance)
Low concentration

9 External examples of diffusion
b. Lotions/Perfume/Unpleasant odors in a closed room

10 Substances that can diffuse across the cell membrane

11 Certain substances can diffuse straight across the phospholipid bilayer

12 Examples of Diffusion a
Examples of Diffusion a. Oxygen and Carbon dioxide exchange in the blood

13

14 Osmosis: Introductory Terms
Solution: A mixture of two or more substances; both are completely dissolved

15 Osmosis: Introductory Terms
Solvent: The dissolver; usually a liquid

16 Osmosis: Introductory Terms
Solute: Disolvee; what is being dissolved

17 Movement of WATER from a high to a low concentration
Osmosis Movement of WATER from a high to a low concentration

18 Hint: a. Water will ALWAYS move to the higher concentration of dissolved substances.

19 b. Solute SUCKS solvent (water)!!!!
Hint: b. Solute SUCKS solvent (water)!!!! Solute Water

20 Isotonic Solution Cell remains same size
Water moves in and out at same rate (time) The concentration of dissolved substances is equal in and out of cell.

21 *RBC Video *Elodea Video

22 Hypo = Hippo (BIG!!! SWOLLEN!!)

23 Hypotonic Solution Cell swells Water moves in
The higher concentration of dissolved substances is __________ the cell.

24

25 *RBC Video *Celery Video

26 Hyper = Hyperactive (Want energy out!!!)

27 Hypertonic Solution Cell shrinks Water moves out
The higher concentration of dissolved substances is __________ the cell.

28

29 *RBC Video *Elodea Video *Onion Video

30 What would happen if a Clown Fish (Nemo) was placed in a freshwater aquarium?
Water would move into the fish cells causing all of the cells to swell and burst; it is a hypotonic environment SALT

31 What would happen if a Goldfish was placed in the ocean?
Water would move out of the fish cells causing all of the cells to shrink; it is a hypertonic environment SALT

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