Post on 28-Dec-2015
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