Kidney and its Role in Maintaining Homeostasis
Do fish pee?
• Which fish has to drink?• Which fish has more dilute urine?
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!!
Role of the Excretory System
• Filtration:
• Rebsorption:
• Secretion:
• Excretion:
Organization of Excretory System
Functional Unit: Nephron Organization
Functional Unit: Nephron Organization
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!
Does caffiene make you pee more?
• Caffiene is a weak inhibitor of ADH.
• What would that do?
• Does coffee/Coca-Cola quench your thirst?
What if your kidneys stop working?
• Hemodialysis
What are kidney stones?
• Buildup of vitamins or minerals.
• Due to diet/genetics
Can you die from drinking too much (water)?
• Yes!• Hyponatremia • What is out of balance?• What organs are affected
Review
• Find an online kidney animation:
• As you are watching the animation, highlight key information from your notes.
• At the end of your notes, identify two new pieces of information you learned!