The excretory system removes waste from the body through the lungs, skin, kidneys, and urinary bladder. The lungs remove carbon dioxide, the skin removes sweat and dead skin cells, the kidneys filter waste from the blood and produce urine, and the urinary bladder stores urine before releasing it through the urethra. This system works with the digestive and respiratory systems to intake nutrients and oxygen and remove waste to keep the body functioning properly. Diseases can occur if the excretory system is not working correctly, such as kidney infections, bladder infections, and kidney stones.

1. The Excretory System
By: Sara, Palavi and Kanyinsola

2. Purpose and Parts
• Provides way for wastes to be removed from
body
• Parts include:
•Lungs (get rid of the wastes carbon dioxide and
water vapor)
•Kidney (main organ, contains nephrons which
filter waste)
•Skin (releases perspiration and has two layers,
epidermis and dermis)
• Urinary Bladder (releases waste through
urethra)

3. Why do we need this System?
• Remove wastes such as excess water and
salts, carbon dioxide and urea (a nitrogen
waste)

4. How does it work?
• Waste gases are carried by blood traveling
through the veins to the lungs
• Dead cells and sweat are removed from the body
through skin
• kidneys filter the wastes from the blood (forms
urine)
• Urine goes into ureters ( carry waste to urinary
bladder)
• Bladder stores urine until muscular contractions
force urine out of the body through urethra

5. How this system works with other
systems
•Digestive system- pathway for food
and water (without excretory
system, body would be filled with
waste = explosion)
• Respiratory system- allows oxygen
into the body and (the waste)carbon
dioxide out

6. Problems and Diseases
•Kidney/ Urologic infections- bacterial
infection in one or both kidneys
•Cystitis- inflammation of the bladder
•Urethritis- swelling and irritation
(inflammation) of urethra
• “Bed wetting”
•Kidney stones- solid mass made up of tiny
crystals
•Pyelonephritis- kidney infection
•Nephritis- inflammation of one or both
kidneys

7. Facts
•Only 40% of people smell urine
• excretes 1-1.5 liters of urine each
day
•Most humans could survive with 1/3
of a kidney
•Kidney receives and filters 1 liter of
blood per minute
•Urinary bladder can store up 470
milliliters of urine before releasing it
•Perspiration gets rid of body wastes