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The Excretory System

Learn how the excretory system eliminates cellular wastes, including excess water, urea, and carbon dioxide, from our body. Discover the important role of the kidneys, lungs, and skin in this process. Understand the signs of disease that can be detected through urine analysis.

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The Excretory System

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  1. The Excretory System How Our Body Eliminates Cellular Wastes

  2. – 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 of chemical wastes, including urea. • Urea-a colorless crystalline compound that is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine Excretory System

  3. 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. I. The Kidneys

  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. 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. II. Signs of Disease

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