1. Agenda 1/25 Osmosis Practice Overview of Disease and Osmosis
Turn in: Chapter notes, video notes, (POGIL for 3rd period)
Homework
1. Water potential video and notes

2. Osmosis Osmosis is the movement of water across a membrane
Water likes to dilute solution, so water will move to the area of higher solute concentration
Or water will move to the area of lower solute concentration

3. 3 Types of Solutions

4. Osmosis Practice!

5. Case Study Directions
As a group, read your case study and answer the questions
Then, create a poster presentation that outlines the following:
1. The disease/problem in your case- symptoms, prevalence, treatment
2. How the disease/problem connects to osmosis
3. Draw a picture that shows the disruption to osmosis
4. Explain how the disruption to osmosis causes the problem/disease
5. Describe any treatments/current research/solutions
Use keywords like: osmosis, solute, concentration gradient, hypertonic, isotonic, hypotonic in your presentation

6. Cholera and Osmosis The Vibrio cholera bacteria produce a toxin
The toxin binds to the walls of the small intestine and activated cAMP
The activate cAMP cause the CFTR channels to stay open
CFTR channels transport chloride ions out of the cell
Chloride ions rush out of the cell
Now, the outside of the cell is hypertonic (too much solute) so water leaves the cells of the small intestines
This leads to watery diarrhea, a main symptom of cholera

7. Cystic Fibrosis and Osmosis
The faulty CFTR channel doesn’t allow chloride ions to leave the cell
This creates a hypotonic solution outside the cell, so water moves into the lung cells
This means that this mucus outside the lung cells gets very viscous and thick
The CFTR doesn’t allow salt to be reabsorbed, so it can cause salty tasting skin