Chapter 30.4 The Excretory System

The excretory system, which includes the skin, lungs, liver, and kidneys, excretes metabolic wastes from the body.
What is the principal role of the structures of the excretory system?
process by which metabolic wastes are eliminated from the body
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-excretes water, salts, and a small amount of urea in sweat
The Skin
-blood transports carbon dioxide, a waste product of cellular respiration, from the body cells to the lungs
-when exhaling, lungs excrete carbon dioxide and small amounts of water vapor
The Lungs
-converts dangerous nitrogen wastes into less toxic urea
-urea is then transported thru the blood to the kidneys for elimination from the body
The Liver
-a pair of fist-sized
The Kidneys

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