Excretory System
--Functions
-Remove liquid waste...what is this waste called?	
-Maintain water balance
- Regulate blood pH
--Composition of Urine
-	Water
-	Urea
Produced when amino acids are burned for energy
-	Uric acid, salts and ammonia
-	Minerals, vitamins and heavy metals

Excretory System
-	Anatomy and Function
-	Skin excretes excess water, salts and a small amount of urea in the form of sweat
-	Majority of work is done by the kidneys
Excretory System
-	Waste-filled blood from the body enters the kidney through the renal artery
Excretory System
-	Inside the kidneys, nephrons filter out urea, excess water, amino acids, drugs and other waste products in the blood
-	Filtered blood is returned to circulation via the renal vein

IV. The Nephron
	A. The kidney contains one million nephrons.
	B. The nephron is the functional unit of the kidney.
V. The formation of urine
B. Reabsorption
C. Secretion
VI. Ureters

B. Urinary Tract Infection (UTI)
1. Caused by a bacterial infection of any part of the urinary tract…How is it treated?
Dialysis