Excretory SystemBy Katie Ust

function Rid of waste, chemical build up, and

useless cell byproducts Maintain balance

Types of Nitrogenous Waste Ammonia – produced by aquatic

animals because only low concentrations can be tolerated

Urea – produced by mammals, adult amphibians, sharks in vertebrate liver

Uric acid – produced mainly by insects, reptiles, and birds because it requires little water loss

Excretory processes

Filtration Renal corpuscle Filters blood

reabsorption Renal tubule Solutes and water

removed from tubular fluid and transported into blood

Excretory Processes

Secretion Transfer of

material from peritubular cavities to renal tubular lumen

Active transport

excretion Rids the body of

unnecessary wastes

nephritis Inflames nephrons Caused by exposure to chemicals and

toxins Symptoms include swelling from

accumulated fluid, urine suppression, and a pale complexion

Kidney stones Crystals are formed around foreign

material Symptoms include pain in side or back

during urination Pain varies case to case, but can be

very serious Can potentially block ureters and must

be removed by doctors

Sources Library.thinkquest.org/07aug/0168/

excretory.html Biologie.uni-hamburg.de/b-online/

library/falk/Excretion/excretion.htm