1. Living Environment Mr. Wiley
Cell Transport
Living Environment Mr. Wiley

2. Demo #1: Vanilla Balloon+
Why can we smell the vanilla inside the balloon?

3. Demo #2: Food Coloring
Record your observations as Mr. Wiley adds food coloring to water

4. Demo #2: Food Coloring What is Happening?

5. Demo #3: Air Freshener
Record your observations as Mr. Wiley sprays perfume in one spot in the room. P
Classroom P P P

6. In all of these demonstrations…
We started with a LOT of molecules in one place We call this: High Concentration In areas with little to no molecules We call this: Low Concentration When there is a High Concentration and low concentration next to each other we call it a: Concentration Gradient

7. Transport
The life function that involves the absorption and circulation of materials throughout an organism.

8. Circulation
What do you think of hear when you hear the term circulation?
Definition- the movement of materials throughout a cell and/or a multi-cellular organism.

9. Absorption
What do you think of hear when you hear the term absorption?
Definition- the process by which digested and dissolved materials enters the cell(s) of an organism.

10. Two main types of transport:
1. Passive Transport
Diffusion
Osmosis
Facilitated Diffusion
2. Active Transport

11. What does it mean to be passive?

12. What are the types of transport?
1. Diffusion – movement of molecules from an area of high concentration to low concentration (High  Low)
NO ENERGY is required!
Small molecules
Ex: Glucose (small sugar), Amino Acids
Occurs across lipid bi-layer

13. Why Diffusion does NOT require energy:

14. What factors influence diffusion?
Temperature
Pressure
Number of molecules inside & outside cell (Concentration Gradient)
Size of the molecules

15. Occurs across lipid bi-layer
2. Osmosis - specific kind of diffusion – only movement of WATER molecules into and out of the cell (High  Low)
NO ENERGY required
Water Molecules
Hint: H2Osmosis!
Occurs across lipid bi-layer

16. Tonicity Tonicity- the amount of water and solute in a cell/solution
Iso- Same Hypo- Less, Low Hyper- More, A lot
Isotonic solution- a solution that has the same concentration of dissolved substances and water molecules as the inside of the cell.
Hypotonic solution- a solution that has a lower concentration of dissolved substances and a higher concentration of water molecules, than the cell.
Hypertonic solution- a solution that has a higher concentration of dissolved substances and a lower concentration of water molecules, than the cell.

17. Tonicity Cell Swells, Grows Cell Shrinks Cell Remains the same
Hypotonic
Hypertonic
Isotonic
100% H2O
50% H2O
70% H2O
Cell
70% H2o
Cell
70% H2o
Cell
70% H2o
Cell Swells, Grows
Cell Shrinks
Cell Remains the same

18. Your teacher facilitates while you complete your labs
Your teacher facilitates while you complete your labs. A coach facilitates a sports game. A parent facilitates a toddler brushing his teeth. What does it mean to facilitate?

19. 3. Facilitated Diffusion – the movement of larger molecules from high to low concentration using transmembrane proteins as “helpers”.
NO ENERGY required
Occurs through proteins
EX: minerals

20. What does it mean to be “active
What does it mean to be “active?” (include your own definition & examples)
Using what you know about diffusion, predict what Active Transport means.

21. 4. Active Transport – movement across the cell membrane from LOW to HIGH concentration
Goes against concentration gradient (low to high)
Requires Energy (ATP)!
Occurs across Transmembrane protein

22. Why Active Transport requires energy:

23. Putting it all together
Passive Transport
Active Transport

24. Putting it all together:
Create a concentration gradient: high concentration outside of cell; low concentration inside cell
Draw diffusion, facilitated diffusion, and active transport occurring. Label the arrows.
What would osmosis look like?

26. Funny Active Transport Video

27. Exocytosis in Paramecium