1. AP Biology Discussion Notes Wednesday 11/04

2. Goals for the Day 1.Be able to understand OSMOregulation based on what you know about osmosis & diffusion. 2.Be prepared for our Lab quiz tomorrow

3. 11/04 Question of the Day What 2 things are the main regulators of whether something can move across the cell membrane?

4. Part 1 Water – Iodine – Starch – Glucose -

5. Part 1 Water & starch outside Iodine & Glucose -inside ? ?

6. Quiz Thursday Lab Questions & CALCULATIONS Know how to calculate (and graph) –% change Water Potential Questions & CALCULATIONS!!

7. Work order for today Video Notes on Osmoregulation –Added later to 2 nd Notebook (just like cell parts) 2 nd Notebook for Diffusion/Osmosis Lab Read pages 184-192 (just finish paragraph at the top of the page) in the text book and take notes. A couple invitations… –Today after school bring your questions and work on lab or other materials (quiz Thursday!)

8. 11/04 Species of the Day Atlantic Bluefin Tuna - Thunnus thynnus

9. 11/04 Species of the Day Atlantic Bluefin Tuna - Thunnus thynnus Relative to it’s body cells, what type of solution does the Bluefin Tuna, an ocean dwelling fish, live in? What does the Tuna do to protect itself from this situation?

10. Marine Animals Most marine invertebrates are osmoconformers Most marine vertebrates and some invertebrates are osmoregulators Marine bony fishes are hypoosmotic to seawater They lose water by osmosis and gain salt by diffusion and from food They balance water loss by drinking seawater and excreting salts © 2011 Pearson Education, Inc.

11. Figure 44.3 (a) Osmoregulation in a marine fish (b) Osmoregulation in a freshwater fish Gain of water and salt ions from food Excretion of salt ions from gills Osmotic water loss through gills and other parts of body surface Gain of water and salt ions from drinking seawater Excretion of salt ions and small amounts of water in scanty urine from kidneys Gain of water and some ions in food Uptake of salt ions by gills Osmotic water gain through gills and other parts of body surface Excretion of salt ions and large amounts of water in dilute urine from kidneys Key Water Salt

12. (a) Osmoregulation in a marine fish Gain of water and salt ions from food Excretion of salt ions from gills Osmotic water loss through gills and other parts of body surface Gain of water and salt ions from drinking seawater Excretion of salt ions and small amounts of water in scanty urine from kidneys Key Water Salt Figure 44.3a

13. Freshwater Animals Freshwater animals constantly take in water by osmosis from their hypoosmotic environment They lose salts by diffusion and maintain water balance by excreting large amounts of dilute urine Salts lost by diffusion are replaced in foods and by uptake across the gills © 2011 Pearson Education, Inc.

14. Figure 44.3b (b) Osmoregulation in a freshwater fish Gain of water and some ions in food Uptake of salt ions by gills Osmotic water gain through gills and other parts of body surface Excretion of salt ions and large amounts of water in dilute urine from kidneys Key Water Salt