Introduction to Excretory System: Homeostatic Water Balance

Read p. 442 – 445

1. Using the terms hypotonic and hyperosmotic, describe the salmon’s environment in the river compared to the ocean.

2. In terms of water regulation, why is the salmon, while surviving in the ocean, similar to a terrestrial animal?

3. Do ques #1

4. What role do proteins play in promoting osmosis and why is this necessary?

5. A cell in a solution is loaded with proteins. Identify the osmolarity of the solution. Which direction will water move?

6. Explain why plant cells will not fill with enough water to cause them to burst.

7. Do ques #2, 3

8. Define excretion, list several organs involved and describe their role. What is the role of the liver in excretion?

9. Do ques # 4- 5, 8, 10, 13