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AP Biology 2008-2009
Excretory SystemKidneys
Regents Biology
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, to excretory system
What do animal cells do to stay alive?
O2
sugar
sugar nutrients
CO2
urea
nutrients
O2
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, diluteocean waters
Warm, diluteocean waters
One-celled Multicellular
Regents Biology
Keeping an animal alive Had to evolve organ
systems for: getting materials in &
around ________________ ________________ ________________
removing wastes ________________ ________________
Regents Biology
What liquid waste do we make?
Digesting protein makes poison __________________________________
H
CO2 + H2O
________________________
H
HN C—OH
|| O
H|
—C—|
Regents Biology
Nitrogen waste disposal on land Land animals
____________________________________ ____________________________________
____________________ ____________________________________
Regents Biology
Human kidney Mammals have a pair of
bean-shaped kidneys supplied with blood by a renal artery
and a renal vein
Regents Biology
Bladder
AP Biology 2008-2009
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