1. Kidney and its Role in Maintaining Homeostasis

2. Do fish pee? Which fish has to drink? Which fish has more dilute urine?

3. Do birds pee? Investment of energy in producing nitrogeneous waste! Fish--little investment-- Ammonia Mammals--some investment for storage in bladder-- Urea Birds--produce uric acid which can be stored as solid waste!!

4. Role of the Excretory System Filtration: Rebsorption: Secretion: Excretion:

5. Organization of Excretory System

6. Functional Unit: Nephron Organization

8. Why are you thirsty? Blood osmolarity is greater than the set point! The extra solute in your blood interacts with receptors in your brain. The hormone ADH (Anti- diuretic hormone) works to correct this!

9. Does caffiene make you pee more? Caffiene is a weak inhibitor of ADH. What would that do? Does coffee/Coca- Cola quench your thirst?

10. What if your kidneys stop working? Hemodialysis

11. What are kidney stones? Buildup of vitamins or minerals. Due to diet/genetics

12. Can you die from drinking too much (water)? Yes! Hyponatremia What is out of balance? What organs are affected