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The Excretory System

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MR. S.

on 15 May 2016

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Transcript of The Excretory System

The Excretory System
What is the role of the Excretory System?
The process of removing wastes is called excretion. If wastes were not removed fro your body, they would pile up and make you sick. The excretory system collects the wastes that cells produce and removes it from the body.
What parts of the body make up the Excretory System?
The parts of the body that make up the Excretory System are the kidneys, ureters, urinary bladder, urethra, lungs, skin, and liver.
What are two wastes that your body must eliminate?
Two wastes that your body must eliminate are excess water and urea.
What is urea and urine?
Urea is a chemical that comes from the breakdown of proteins. Your lungs eliminate some water, but most remaining water is eliminated in a fluid called urine.
Structures That Remove Urine

Kidneys- the major organs in the excretory system,act like filters
Ureters- two narrow tubes that get urine flow from kidneys
Urinary Bladder- a muscular sac that stores urine
Urethra- the small tube in which urine leaves the body

Waste Filtration
Each kidney has about one million nephrons. A nephron is a tiny filtering facrory that removes wastes from blood and produces urine. The nephrons filter wastes in two stages. First, both wastes and needed materials are filtered out of the blood. Next, much of the needed material is returned to he blood, and the wastes are eliminated from the body.
How does excretion help yo
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