1. DO NOW:
Complete the Cell Membrane Review questions on the slip on your desk.

2. Let’s go over the Do Now.
1. Check all answers that are correct. To ensure a cell is capable of obtaining the appropriate amount of nutrients and is able to remove all wastes, the cell must ___ increase density ___ increase surface area ___ remove its membrane ___ reduce volume

3. Let’s go over the Do Now.
Use the word bank to correctly label the diagram below by writing the correct letter in the blanks. D A B C E
Carrier protein
Polar
Phospholipid bilayer
Channel protein
Nonpolar

4. TODAY’S TOPIC: Cellular Transport Part 1 – Passive Transport
LAB: Air Freshener Beads as Cells
Notes Part 1: Osmosis/Diffusion
Practice: Osmosis/Diffusion worksheet
Notes Part 2: Facilitated Diffusion
Homework: Review Worksheet – Passive Transport

5. Today’s Lab
PROBLEM: What happens to the weight of air freshener beads when they are placed in fresh, medium salt, and high salt water?

6. FOR TODAY’S LAB:
1) Read the background information and answer the pre-lab questions. 2) Carefully follow each step in the directions and complete each step before moving on to the next one. 3) Record your initial data. We will take the final data next class period. Be sure to label your cups so you know which ones are yours!

7. What is a concentration gradient?
A concentration gradient is a change in the concentration of molecules (solute) from one area to another.
HIGH CONCENTRATION
LOW CONCENTRATION

8. Concentration gradient
Moving WITH/ALONG the concentration gradient (going from HIGH concentration to LOW concentration  REQUIRES NO ENERGY Moving AGAINST the concentration gradient (going from LOW concentration to HIGH concentration)  REQUIRES ENERGY

9. MOLECULES MOVE FROM HIGH CONCENTRATION TO LOW CONCENTRATION
IN ORDER TO SPREAD OUT
THIS REQUIRES NO ENERGY

10. PASSIVE TRANSPORT
Passive transport is the movement of molecules from an area of HIGH concentration to an area of LOW concentration (with or along the concentration gradient) Does NOT use ENERGY
NATURE ALWAYS WANTS TO BE HERE H L H L

11. THREE TYPES OF PASSIVE TRANSPORT:
(NO ENERGY)
1) DIFFUSION: The movement of solute from high to low concentration
2) OSMOSIS: The diffusion of water (movement of water from high to low concentration)
3) FACILITATED DIFFUSION: The movement of solute from high to low concentration with the help of a protein

12. DIFFUSION – movement of molecules from high to low
(NO ENERGY REQUIRED)
DIFFUSION – movement of molecules from high to low

13. OSMOSIS – diffusion of water (still high to low)
(NO ENERGY REQUIRED)
OSMOSIS – diffusion of water (still high to low)

14. TONICITY
Comparing the concentration of SOLUTE in two solutions: Hypertonic: higher concentration of solute Hypotonic: lower concentration of solute Isotonic: the same concentration of solute
HYPOTONIC
ENVIRONMENT
ISOTONIC
ENVIRONMENT
HYPERTONIC
ENVIRONMENT

15. NOW YOU PRACTICE:
Complete the OSMOSIS worksheet on your own quietly. Be sure to raise your hand if you have any questions!

16. FACILITATED DIFFUSION
(NO ENERGY REQUIRED)
FACILITATED DIFFUSION
The movement of solute from high to low with the help of a protein (some molecules need help!)
Channel Proteins: have a tube through which molecules can pass into the cell
Carrier Proteins: molecule binds to it and it changes shape to allow the molecule into the cell H L H L