The Excretory System EQ How does our body

The Excretory System EQ: How does our body eliminate cellular wastes?

Function of the Excretory System ¬Removes excess water (H 2 O), urea, carbon dioxide (CO 2), salt, uric acid, and other wastes from our blood.

Structures of the Excretory System 1. 2. 3. 4. Skin Lungs Liver Urinary System Think – Pair – Share: Can you guess how these structures are a part of the excretory system?

Skin Wastes such as excess water, salt, urea and uric acid are removed from the body in sweat.

Lungs ¬The lungs is a part of what other system? ¬The respiratory system

Lungs Excess carbon dioxide waste is removed from the body when we exhale. CO 2

Liver ¬The liver is a part of what other system? ¬The digestive system Liver

The Liver and Waste ¬ The liver produces urea and uric acid as a by-product of the breakdown of proteins. ¬ Urea and uric acid are sent to the kidneys to be processed. Liver

The Kidneys ¬Kidneys –filter the blood to form urine, which is excess water, salt, urea and uric acid. ¬Every drop of blood in your body is filtered by your kidneys more than 300 times per day!

How the Kidneys Work ¬ 1—Arteries bring blood to the kidneys. ¬ 2—Blood vessels branch off to nephrons. ¬ 3—Nephrons filter urea.

Eliminating Waste ¬Ureters – tubes that take urine from the kidney to the urinary bladder. ¬Urinary Bladder – a sack that stores urine. ¬Urethra – small tube that leads urine out of the body.

Excretory/Urinary System Video