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The Excretory System Pages 154-159
Transcript of The Excretory System Pages 154-159
What is the Role of the Excretory System?
The process of removing wastes is called excretion. If wastes were not removed from your body, they would pile up and make you sick. The excretory system collects the wastes that cells produce and removes them from the body.
What are the body systems included in the excretory system?
The body systems are the kidneys, ureters, urinary bladder, urethra, lungs, skin, and liver.
What is urea and urine?
Urea is a chemical that comes from the breakdown of proteins. Urine eliminates remaining water that the lungs can not remove including urea and other wastes.
Structures That Remove urine
Kidneys- the kidneys are the major organ of the excretory system, act like filters
Ureters- the small narrow tubes in which urine flows from the kidneys
Urinary Bladder- a muscular sac that stores urine
Urethra- the small tube in which urine leaves the body
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Each kidney has about one million nephrons.
A nephron is a tiny filtering factory 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 the blood, and the wastes are eliminated from the body.
How does excretion help your body maintain homeostasis?
Excretion helps to maintain homeostasis by keeping the body's internal environment stable and free of harmful levels of chemicals.
As the kidneys filter blood, they regulate the amount of water in your body to help maintain homeostasis. As urine is formed, needed water passes from the nephron tubes in the blood. The amount of water that returns to the blood depends n conditions both outside and inside the body.
Lungs, Skin, and Liver
The lungs, skin, and liver also help in removing wastes. For example, when you exhale, carbon dioxide and some water are removed from the body through the lungs. Sweat glands in the skin produce perspiration that contains water and a small amount of urea. The liver makes urea from broken down proteins. In addition, the liver breaks down many wastes into forms that can be excreted.