Topic: Excretory System Aim: Describe parts & functions of the Excretory System. Do Now: Describe the path of food through the digestive system. HW: Complete.

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Topic: Excretory System Aim: Describe parts & functions of the Excretory System. Do Now: Describe the path of food through the digestive system. HW: Complete the notes on Nutrients (first page of your packet) pgs

Function Removal of metabolic (cellular) wastes from the body

Metabolic wastes: –CO 2, H 2 0, salt, nitrogenous wastes (urea)

PARTS OF THE EXCRETORY SYSTEM

Lungs Excrete CO 2 & H 2 O vapor CO 2 & H 2 0 vapor

Skin Excrete urea, salt & water in sweat (perspiration)

Temperature regulation –Evaporation of sweat from skin cools body Maindex

Liver Produces UREA –Released into blood and then moves to kidneys

Detoxification = waste products, toxins, and drugs removed from the blood

Kidneys a. Filter wastes from blood

b. Maintains water balance in body c. Produces urine

Did you know… About 440 gallons of blood flow through the kidneys each and every day! If you eat a lot of red beets, your urine will actually be colored red. The average person passes 9,202 gallons of urine in his/her lifetime. That’s enough to fill 315 bathtubs.

Urinary System

Kidneys Blood filtered Urine produced

Ureters Transport urine from kidneys to bladder

Urinary Bladder Muscular organ that stores urine

Urethra Tube that leads urine out of the body

Let’s summarize… 1.Explain the function of the excretory system. 2.Explain the difference between excretion and egestion. 3.Describe the major organs of the excretory system and their functions.

1.Identify A, B, and D. 2.Which organ produces urea? 3.What is the function of D? 4.What does organ A excrete? 5.Which organ detoxifies the blood?

1.Identify structures A, B, C, and D. 2.Which structure produces urine? 3.What is the path of urine? 4.What are the 2 main functions of A? 5.What stores urine? 6.What is the function of D? 7.Where would kidney stones form?

1.Which letter in the diagram below indicates the organ that is involved in the production of urea? 2.Which organ filters urea from the blood?

1. Which letter indicates a structure responsible for filtering urea out of the bloodstream? 2. Which organ contains nephrons? 3. What is the function of D?

Why are the lungs considered to be excretory organs?

Which human excretory structure aids in the maintenance of normal body temperature?

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