1. The Excretory Systems

2. What is Excretion?
Process of eliminating waste products from our bodies.

3. 4 Systems to Eliminate Waste
Urinary: Kidneys
Respiratory: Lungs
Sweat Glands
Digestive: Intestines

4. Sweat Glands About 2 500 000 Discharge sweat through pores
Helps control body temperature as well.

5. Sweat Glands
Sweat made up of
water
other waste materials

6. The Urinary System Composed of the following: Kidneys Ureters Bladder
Urethra

7. Kidneys 2 reddish bean-shaped organs
Eliminate waste and maintain blood balance by filtering blood and producing urine

8. Kidneys
Help maintain the blood balance (mineral concentration and amount of water)
Excess in the blood  kidneys will excrete them
Amount of urine depends on the concentration of minerals and water in blood.
If concentration of minerals is too low, kidneys will excrete more water  mineral concentration
If body lacks water and concentration of minerals is too high, kidneys excrete less water and we feel thirsty!!!

9. Ureters
2 x 25 cm tubes
Transport urine produced in kidneys to bladder

10. Bladder Pear-shaped reservoir with elastic walls
Stores urine until urination
can hold about 1 L of urine

11. Urethra Channel/tube 3-4 cm for women About 20 cm for men
Transports urine from the bladder to the outside

12. Composition of urine Water (95%) Urea (breakdown of amino acids)
Minerals
Substances in excess (vitamins, medication, etc)