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The Excretory System

Learn about the excretory system, including how it removes excess water, urea, and carbon dioxide from the body. Discover the important role of the kidneys in filtering blood and regulating water levels. Understand how doctors analyze urine for signs of disease.

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The Excretory System

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  1. The Excretory System How Our Body Eliminates Cellular Wastes

  2. Excretory System – removes excess water, H2O, urea, carbon dioxide, CO2, and other wastes from our blood. • Kidneys – filter out excess water and urea • Lungs – filter out carbon dioxide, CO2, from the blood. • Skin – excretes water, as sweat, which contains some trace chemical wastes, including urea.

  3. I. The Kidneys • Every drop of blood in your body is filtered by your kidneys more than 300 times per day! • Kidneys eliminate urea, minerals and excess water. • Kidneys regulate the amount of water we need to maintain in our bodies.

  4. Kidneys – filter wastes and excess water from the blood. 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.

  5. II. Signs of Disease Doctors analyze urine for disease; • Normal urine contains water, urea and trace minerals. • Sugar in urine indicates Diabetes • Protein in urine indicates the kidneys are not working and the person, or animal, is very sick.

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