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Excretory System Kidneys

Explore how animal cells stay alive, move materials, and dispose of waste through various organ systems like kidneys. Learn about different types of nitrogen waste disposal in water and on land, including the unique case of egg-laying animals. Discover the role of uric acid in bird and reptile waste excretion.

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Excretory System Kidneys

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  1. Excretory SystemKidneys

  2. nutrients sugar CO2 urea O2 nutrients sugar O2 What do animal cells do to stay alive? • Animal cells move material across the cell membrane by __________________ • ________________________ • from digestive system • ________________________ • from digestive system • ________________________ • from respiratory system • ________________________ • CO2,urea from cells • to respiratory system & excretory system

  3. Unicellular  Multicellular Warm, dilute ocean waters Warm, dilute ocean waters Unicellular Multicellular • All cells in direct contact with environment • All cells can easily get nutrients in & waste out by __________________ • Internal cells not in direct contact with environment • Internal cells can’t get nutrients in & waste out • _______________________

  4. Keeping an animal alive • Had to evolve organ systems for: • getting materials in & around • ________________ • ________________ • ________________ • removing wastes • ________________

  5. H N H What liquid waste do we make? • Digesting protein makes poison • _________________________________ H | —C— | O || C—OH CO2 + H2O R ____________________________

  6. Nitrogen waste • The kind of waste you make depends on where you live • ________________ • ________________ • ________________ • ________________ • ________________ • ________________

  7. Nitrogen waste disposal in water • Freshwater animals • If you have a lot of water you can dilute the waste before it poisons you • __________________________________________________________________

  8. Nitrogen waste disposal on land • Land animals • _________________________ • _________________________ _________________________ • _________________________ • _________________________

  9. Human kidney • Mammals have a pair of bean-shaped kidneys • supplied with blood by a _______________ and a _______________

  10. Bladder

  11. Nitrogen waste disposal in egg • Egg-laying land animals • no place to get rid of waste while in egg • needs waste that doesn’t dissolve in water inside egg • ____________________________ • stays a powder, doesn’t dissolve in water • birds, reptiles, insects

  12. Getting a little personal,aren’t we! Uric acid • Bird & reptile waste • large molecule that doesn’t dissolve in water inside egg • stays as a white powder • doesn’t harm embryo in egg • adults excrete white paste not liquid waste • white bird poop is really their pee! • this is why male birds don’t have a penis!

  13. Don’t be a chicken… Ask Questions!!

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