1. Cell Transport Cell/Plasma Membrane
Regulates what enters and leaves the cell and provides protection and support.
Phospholipid Bilayer
Selectively Permeable

3. Cell Membrane Model Cell/Plasma Membrane
FIRST color the phospholipid bilayer!
Blue – phosphate heads
Red – lipid tails
Purple - protein

4. Cell Transport
Passive Transport – when the cell does not require energy to move molecules across a membrane.
Movement from high to low concentration (conc.)

5. Passive Transport Diffusion Definition
Vocabulary
Particle movement from an area of high concentration to an area of low concentration.
Equilibrium – when the concentration of the solute is the same throughout a system.

6. How does temperature affect diffusion?
Hot Water
Cold Water
Room Temp. Water
How does temperature affect diffusion?
Why is a warm body advantageous to a living thing?

7. Passive Transport
Diffusion
Picture
Examples

8. Passive Transport Osmosis Definition Vocabulary
The diffusion of water through a selectively permeable membrane.
Isotonic – The concentration of solutes is the same inside and outside the cell
Hypotonic – solution has a lower solute concentration than the cell.
Hypertonic – solution has a higher concentration of solute than the cell

10. Passive Transport Osmosis Picture Examples
Fill this in after GummyBear Lab!

11. Gummy Bear Lab

14. Facilitated Diffusion
Passive Transport
Facilitated Diffusion
Definition
Vocabulary
Movement of specific molecules across cell membranes through protein channels
Protein channel – act as “doorways” for larger molecules, and allow certain molecules to cross membrane

15. Facilitated Diffusion
Passive Transport
Facilitated Diffusion
Picture
Examples
Red blood cells have a cell membrane protein that allows glucose to pass through it.
Does not need energy!

16. Active Transport
Active Transport – energy-requiring process that moves material across a cell membrane against a concentration difference.

17. Active Transport Molecular Transport Definition
Vocabulary
When small molecules and ions are carried across membranes by proteins in the membrane that act like energy-requiring pumps
Needs ENERGY! Moves from low concentration to high concentration

18. Active Transport Picture Examples
Molecular Transport
Picture
Examples
Many cells move calcium, potassium, and sodium across cell membranes

19. Active Transport Endocytosis Definition
Vocabulary
Process of taking material into the cell by means of infoldings, or pockets, of the cell membrane
Phagocytosis – “cell eating” extensions of cytoplasm surround and engulf large particles and take them into the cell
Pinocytosis – cell takes in liquid from the surrounding environment

21. Active Transport Endocytosis Picture See previous slide. Examples
Amoeba’s use endocytosis to get their food

22. Gummy Bear Lab Day 2

23. Active Transport Exocytosis Definition
Vocabulary
None
Process by which a cell releases large amounts of material

24. Active Transport Exocytosis Picture Examples
Cell can get rid of waste or cellular materials this way

25. Determine passive vs. active; give specific type
A cell membrane encloses and takes in a drop of fluid.
Carrier proteins use energy and act as a pump to move nutrients into a root cell.
Carrier proteins take sugar (glucose) into a cell without requiring energy input.
Water diffuses across a cell membrane from a region of high concentration to a region of low concentration.
Mucus and waste products packaged by Golgi apparatus are secreted by a cell.
A cell membrane encloses and takes in large food particles.

26. Passive or active?

27. Passive or active?

28. Passive or active?

29. Food particle
Amoeba
Passive or active?

30. Passive or active?

31. Passive or active?

32. Gummy Bear Lab Day 3

33. Plasmolysis Obtain a piece of red onion, slide and cover slip.
Create a wet mount slide with water.
Observe the appearance of the cells under the microscope.
Use toweling method to add several drops of salt water.
What happened?
Why?

34. Before Salt Water
After Salt Water