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

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 Types of Solutions

Osmosis Practice!

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

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

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