1. Excretory System

2. Toxic substances must be eliminated
ex. Carbon dioxide
(waste combustion of carbs and fats)
nitrogenous waste
(combustion of proteins)

3. Excretion Process by which waste products are eliminated.
Mainly: lungs, kidneys, sweat glands

4. Sweat Glands 2 500 000 sweat glands on our surface.
Helps our bodies keep a constant temperature (hot weather, exercise)
Composed of water, waste materials

5. Urinary System Kidneys, the ureters, bladder, urethra
Filters blood to remove urea,
nitrogenous waste, excess water and mineral salts

7. Kidneys Dark red, bean shaped
Eliminates waste and maintain blood balance
Filter blood-Nephrons-millions, small filtration unit
See table 6.48, p.192

8. Urine Waste from oxidation of amino acids (urea and water)
Maintain water and mineral content in the blood. Excess water
Water, urea, minerals, excess substances (protiens etc.)
See p. 193