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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