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Excretory System
The system that excretes waste from the body.
Sponge

Water flow through the sponges orifice and pores caries out the
waste.
 Any mineral particles, that enter the sponge through the water
flow system, that threaten to block the sponge, are transported
through the mesohyl (a gelaatious matrix within the sponge) and
are generally dumped into the outgoing water current.
Earth Worm
Frog
 The organs in the frogs execratory system are the:
Kidneys
 Ureters
 Bladder
 Cloaca
 Along with all of these organs, frogs also exchange substances
just like mammals through their skin. An example of this would
be water.
 The Frogs excretory system starts by liquid wastes traveling
from the kidneys to the ureters then to the urinary bladder. The
solid wastes however pass into the cloaca from the large
intestine. Both of these waste materials leave the body through
the cloaca and the cloacal vent.

Human
 Wastes that are removed in the human excretory system are;
carbon dioxide, water, urea, and uric acid. All these wastes that
are excreted travel through the blood stream at some time.
 Organs of the human Excretory System and their function are:
 Lungs – remove excess carbon dioxide.
 Liver – produces urea and uric acid as a by-product of the
breakdown of proteins.
 Skin – Removes excess water, salt, urea, and uric acid
through sweating.
 Aorta – Starts on the left side of the heart and sends blood to
main parts of the body. Including the kidneys.
 Urinary System (bladder, kidneys, ureters) – The kidneys filter
the blood to form urine containing excess water, salt, urea, and
uric acid.
Sources:
 http://qldscienceteachers.tripod.com/junior/biology/excretory.htm
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http://answers.yahoo.com/question/index?qid=20090401225022
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http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio
%20102/bio%20102%20lectures/animal%20diversity/lower%20i
nvertebrates/sponges.htm
http://www.lookd.com/frogs/anatomy.html
http://www.scienceray.com/Biology/Human-Biology/HumanBody-The-Excretory-System.116217