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The Excretory System

The excretory system plays a vital role in removing waste from the body, much like trash collectors. Your cells utilize nutrients from food, producing waste that must be excreted. Urine, composed of water and urea, is the primary waste product eliminated through a pathway involving the kidneys, ureters, urinary bladder, and urethra. The kidneys filter approximately 180 liters of fluid daily, with only about 2 liters becoming urine. Maintaining water levels is crucial for homeostasis, and analyzing urine can reveal health insights, such as diabetes risk or kidney function.

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The Excretory System

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  1. The Excretory System HB&H Chapter 5.3 Pages 145-150

  2. What a Waste • Your cells use up nutrients from food (protein, carbs, vitamins) and create waste • The Excretory System collects and removes waste from the body • Like trash collectors • Process of removing waste is called Excretion.

  3. Your Wha? • To leave the body, urine follows this path… • Kidneys • Ureters – tubes leading out of the kidneys • Urinary Bladder – pouch that stores urine • Urethra – tube that leads out of the body • Urea and other waste is removed from the body in the form of Urine: mixture of water and urea.

  4. Organs of Importance • The major organs of the Excretory System are your two Kidneys • Kidneys filter out waste called Urea, a chemical made from broken down proteins.

  5. Filtration Station • Your kidneys filter 180 liters of fluid each day • Only about 2 liters are converted into Urine • The kidney contains hundreds of thousands of filters called Nephrons: structures that remove waste from blood.

  6. Water Weight • Up to 60% of your body is water • You need to take in 2 liters of water a day • Kidneys help maintain water levels to keep you in Homeostasis (stable internal environment).

  7. Ur-ineTrouble! • Urine can be tested to check for illness • Glucose (a simple carb) in the urine indicates risk of Diabetes • Protein in urine can indicate problems with your kidneys • Urine is also a good indicator of your hydration levels.

  8. Exit Pass What are 2 of the 4 parts of the Excretory System?

  9. What to Work On • Read Section 5.3 in your textbook (pages 145-150) • Answer the section review questions (#’s 1-4) on page 150 DUE: Friday, April 27th

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