1. Cell Transport

2. Past learning: What is the function of the cell membrane?

3. Cyclosis: the streaming of cytoplasm

4. DIFFUSION
The movement of molecules from an area of high concentration to an area of low concentration without using cell energy
Examples:
The smell of perfume through a room
Sugar in coffee
Food coloring in water

5. Diffusion
high concentration
low concentration

6. In which cell is diffusion occurring?B
How do you know?
Molecules are moving from high to low

7. In which direction will these molecules diffuse?
high concentration
low concentration

8. Why do molecules move from high concentration to low concentration?

9. All molecules are always in motion.
Gas
Solid
Liquid
The higher the temperature, the faster they move.

10. Brownian Motion
Robert Brown observed particles inside of vacuoles vibrating. He stated that ALL particles are moving ALL the time.

11. Not to be confused with Brownie in Motion

13. Diffusion

14. Factors that affect Diffusion
Concentration – greater concentrations results in more rapid diffusion
Temperature: greater temperature results in greater speed of molecules

15. Facilitated Diffusion
Molecules move rapidly across the cell membrane through a transport protein

16. Equilibrium
Equilibrium is reached when molecules are evenly distributed

17. Equilibrium is reached.
Into the cell or Out of the cell?
Out of the cell.
Into the cell.
until...
Equilibrium is reached.

19. Osmosis
Diffusion of water through a membrane

20. Concentration Gradient
The difference in concentration between an area of greater concentration and one of lesser concentration
Diffusion occurs whenever there is a concentration gradient

21. Passive Transport
Process by which materials move across the cell membrane without the expenditure of cellular energy
Examples: Osmosis and Diffusion

22. Active Transport
The process by which materials move across the cell membrane with the expenditure of cellular energy
This allows the cell to be chemically different from it’s surroundings
Moves molecules from low concentration to high concentration
Examples: phagocytosis,pinocytosis and endocytosis

25. In which cell is active transport taking place?
Cell A
Is energy required?
Yes!!!

27. Isotonic solution
Contains the same concentration of dissolved substances as the cell placed in it

28. Hypotonic Solution
Contains a lower concentration of dissolved substances than the cell
Water is more concentrated outside
Animal cells swell and burst
Plant cells excess water is collcted inside the vacuole

29. Hypertonic Solution
Has a higher concentration of dissolved substances than the cell
Water is more concentrated on the inside
Animal cells shrink
Plant cells the vacuole will collapse and the cytoplasm will shrink

30. Iso hypo hyper