1. …because cellular teleportation isn’t real
Cell Transport
…because cellular teleportation isn’t real

2. What are the Functions of the Cell Membrane?
WARM UP
In your notes, answer the following question;
What are the Functions of the Cell Membrane?

3. WU - Functions of the Cell Membrane
1) Controls what goes in/out of the cell
(is semi-permeable or selectively permeable) to maintain homeostasis.
Acts as a protective barrier to keep the internal metabolism/reactions separate from the outside
Responsible for Cell to Cell Communication; also known as Cell Signaling
Responsible for Cell to Cell Recognition

5. Cell Membrane Structure
Fluid Mosaic Model
The Fluid Mosaic Model states that the cell membrane is like an ocean of phospholipids and proteins, they are able to move around freely
This structure of the Cell Membrane allows for the Transport of molecules across the membrane.

6. There are 2 types of Transport, ACTIVE and PASSIVE.
Transportation
The integral proteins in the cell membrane transport things into and out of the cell in two different ways based on the concentration gradient.
Molecules will naturally travel from where there is a high amount to where there is a low amount
There are 2 types of Transport, ACTIVE and PASSIVE.

7. Passive Transport
Molecules move from High Concentration to Low Concentration on their own with No Energy
Since molecules naturally go from where there is more to where there is less, this does NOT require energy (ATP)

8. 3 Types of Passive Transport
Diffusion – Solute molecules travel down the concentration gradient through the cell membrane (like O2 and CO2)
The rate of diffusion can be affected by:
temperature
agitation (mixing/stirring)
particle size
concentration difference
pressure

9. Types of Passive Transport
Facilitated Diffusion – Solute molecules go down the concentration gradient using transport proteins
Channel Proteins – tunnels that molecules can pass through
Carrier Proteins – proteins open and close to transport molecules

10. Types of Passive Transport
Osmosis – Water moves across the cell membrane, very important to maintain homeostasis
The water moves to dilute the side with a higher concentration of Solute particles

11. Passive Transport
All passive transport tries to achieve dynamic equilibrium (when the molecule to solution ratio is equal on both sides) This is to preserve HOMEOSTASIS!
1 molecule
per 1 ounce
3 molecules
per 1 ounce
2 molecules
per 1 ounce
2 molecules
per 1 ounce

12. There are 2 Types of Active Transport.
Molecules move from Low Concentration to High Concentration with help and MUST use Energy
ATP
ATP
Since molecules naturally go from where there is more to where there is less, forcing them to do the opposite requires energy (ATP)
There are 2 Types of Active Transport.

13. 2 Types of Active Transport
Protein Pump – Protein that uses energy (ATP) to transport molecules against their concentration gradient
Example: Na+/K+ Pump (Sodium-Potassium Pump)
out in

14. Types of Active Transport
2. Vesicular Transport - Bulk Transport using vesicles
A. Endocytosis – Cell takes in molecules by making a membrane bubble around it
I) Phagocytosis – cell eating II) Pinocytosis – cell drinking

15. Types of Active Transport
B. Exocytosis – Cell gets rid of molecules by fusing a membrane bubble to the cell membrane

16. Activity
Using only paper and markers, create a FUN Poster that describes one type of Transport. You can make an analogy, cartoon, picture, etc. for your poster.
Your teacher will have you draw a type of transport from a bowl.
You may work in groups of 4 to create your poster. Write all members names on the back of the poster.
Due at the end of class today!