2. AP Biology 2008-2009 Excretory System Kidneys

3. Regents Biology  Animal cells move material across the cell membrane by _____________  ____________________  from digestive system  ____________________  from digestive system  ____________________  from respiratory system  ____________________  CO 2, urea from cells  to respiratory system, to excretory system What do animal cells do to stay alive? O2O2 sugar nutrients CO 2 urea nutrients O2O2

4. Regents Biology 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 _______________________ Warm, dilute ocean waters Warm, dilute ocean waters One-celled Multicellular

5. Regents Biology Keeping an animal alive  Had to evolve organ systems for:  getting materials in & around  ________________  removing wastes  ________________

6. Regents Biology What liquid waste do we make?  Digesting protein makes poison  __________________________________ H CO 2 + H 2 O ________________________ H H N C—OH || O H | —C— |

7. Regents Biology Nitrogen waste disposal on land  Land animals  ____________________________________  ____________________  ____________________________________

8. Regents Biology Human kidney  Mammals have a pair of bean-shaped kidneys  supplied with blood by a renal artery and a renal vein

9. Regents Biology Bladder

10. AP Biology 2008-2009 Don’t be a chicken… Ask Questions!!