1. Excretory system

2. Purpose
The excretory systems purpose is to remove wastes from the body
The wastes can be liquids, solids, or gases
Other systems are involved

3. Urinary System
The purpose of the urinary system is to remove wastes from the body in a liquid form called urine.
The four major parts to the urinary system are the kidneys, ureters, bladder and urethra.

4. Kidneys Two bean shaped organs found at approximately waist level.
The filtering unit of the kidney is known as the nephron.
Each nephron has a cup-like structure called the Bowman’s capsule and a duct.
The nephrons filter the blood for wastes

5. Pictures

6. The ureters
Two relatively thin tubes that attach the kidneys to the bladder.

7. Bladder
Muscular storage unit for holding urine until it is ready to be released.
Can Hold about a half a liter of fluid

8. Urethra
A single tube that flows from the bladder to the outside for the release of urine.
Can become infected and inflamed with bacteria .
Common beginning site for a urinary tract infection.

9. Diseases
Some diseases of the urinary system are benign and just require antibiotics for treatment.
You only require one kidney to work.
If both kidneys fail then you need dialysis which is the artificial filtering of the blood for waste.

10. Skin
The skin- responsible for sweating and the release of wastes

11. Skin Largest organ Made up of three layers Epidermis- outer most layer
Made up of dead skin cells
Acts an water repellant and first protection for your body
Melanin- your skin pigment or color is produced here

12. Dermis and Fatty layer Dermis- middle layer Thicker than the epidermis
Blood vessels, nerves, oil glands and sweat glands are found
here
Fatty layer- inner most layer
Insulates the body

13. Skin functions Major job is protection
Protects from physical and chemical injury
Protects from bacteria
Sensory response
Sense of touch

14. Skin functions cont. Vitamin D production Helps absorb Calcium
Regulates body temperature
Rid the body of wastes
In the process of sweating- the body is removing
Water
Salts
Other waste products like carbon dioxide

15. Skin functions cont.
Your body can only withstand a limited range of temperatures
If body becomes too hot then you will sweat
The sweat will evaporate and cool the body
Regulates body temperature and wastes
In the process of sweating- the body is removing
Water
Salts
Other waste products like carbon dioxide

16. The digestive system
Solid waste exits the rectum after the water has been reabsorbed in the large intestine

17. Lungs
Lungs are part of the respiratory system and are responsible of the removal of carbon dioxide and some water.