1. Osmoregulation in Animals
Chapter 44

2. Osmoconformers vs. Osmoregulators

3. How does a salmon survive?
Usually osmoregulation uses about 5% of metabolism.
Osmoregulation in extreme saline conditions: up to 30%

4. Key functions of osmoregulation
Get rid of nitrogeneous waste
What are the advantages/disadvant ages of types of waste?
Retain water
How does the kangaroo rat survive?

5. Processes Filtration Reabsorption Secretion Excretion
Gets rid of waste; yet retains key materials!

6. Mammalian Excretory System

7. Functional Unit: Nephron
99% of water is reabsorbed!
1000 L pass through kidney to make 1.5L of urine each day!

8. Describe how the filtrate changes…

9. Key Concept: Active transport drives the passive transport of water

10. Hormonal Balance Two systems: What is the stimulus for each system?
What hormones are involved?
How do hormones cause a response?

11. ADH

12. RAAS

13. Reviewing Hormones
Mini Case Study: Alcohol inhibits ADH. A college student was binge drinking. The student passed out and friends just figured they’d let him “sleep it off.” Knowing what you know about the feedback and osmoregulation, why is this a bad choice?

14. Compare and Contrast
Osmoregulation in saltwater vs. freshwater fish!

15. Compare and Contrast the Following Excretory Organs
Name of Structure
Organisms
How structure works
Protonephrida
Metanephridia
Malphigian Tubules