1. EXCRETORY SYSTEM
Chapter 48 section 3 PP

2. Excretory System Every cell in the body produces metabolic waste.
Skin, lungs, and kidneys make up this system.

3. Function
SKIN
LUNGS
Excretes water, salts, small amounts of nitrogenous wastes
Excretes water vapor and CO2

4. Function: Urinary System
Formation and excretion of urine
Urine is mostly water, keeps wastes dissolved and easier to excrete
Involves Kidneys and Bladder

5. Steps: Filtration Blood forced into kidneys
Urea, wastes, and various substances are removed

6. Steps: ReAbsorption
Some substances are return to blood; maintain balance
Ex. Salts

7. Steps: Elimination
Waste (urine) is stored in bladder until it is secreted through the urethra

8. Urine Waste removed from the blood by the kidneys
Contains urea, water, salt
Very light yellow color

9. What Urine Tells Us Kidney Damage - Proteins may leak into the urine
Dark Yellow color - dehydration
Brown color - bleeding from the kidneys
High Glucose - the individual is diabetic
Low or no glucose - hypoglycemia, which results from too much insulin