Excretory System
DENNIS ANYAMELE
Functions & Purpose
The purpose of the excretory system is to get rid of
waste in the body and help maintain homeostasis in
an organism.
Role in Homeostasis
The excretory system helps the body maintain
homeostasis, a stable internal environment. It does
this by removing waste to keep the body function
properly.
Interaction with Other Systems
The excretory system works the most with the
circulatory and endocrine system. The circulatory
circulates blood through the system to get rid of
unneeded substances. The endocrine system
monitors kidney function so that the cell will have
the best internal temperature.
Evolution of Excretory System
The excretory system has evolved from a series of
tubules in every segment of the body into the
complex system that it is now.
Organs
Primary
Peripheral
 Liver
 Bladder
 Skin
 Urethra
 Lungs
 Ureters
 Kidneys
Liver
The liver gets rid of overused red blood cells and left
over amino acids from the blood and breaks down
the waste
Skin
Sweat glands throughout the skin get rid of urea,
salts, and water from the blood through sweat.
Lungs
Water vapor and carbon dioxide, products of cellular
respiration, are excreted from the body through the
lungs.
Kidneys
Filters throughout the kidneys, called nephrons, filter
urine from the blood to be excreted.
Ureters, Bladder, & Urethra
The ureters, urinary bladder, and urethra work
together to get rid of waste by urine.
Conclusion
The excretory system keeps the body running by
getting rid of waste that would not make the body
function properly.
Citation Page

Qld science teachers. (2011, November 22). Retrieved from
http://www.qldscienceteachers.com/junior-science/biology/excretory-system

Activity 8-2. Human Excretory System. (n.d.). Retrieved from
http://www.columbia.edu/~mvh7/STEP/Regents Bio/The endocrine
system/human excretory system.pdf

Cliff Notes. (2012). Cliff Notes. Retrieved from
http://www.cliffsnotes.com/study_guide/Human-Excretory-System.topicArticleId8741,articleId-8714.html

Lubey. (n.d.). roderunner.com. Retrieved from
http://home.roadrunner.com/~lubehawk/BioHELP!/hexcrsys.htm

Farabee, M. J. (2010, May 18). Excretory System. Retrieved from
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookEXCRET.html

Radar studios, A. (2011). Animal Systems. Retrieved from
http://www.biology4kids.com/files/systems_excretory.html