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Review Excretory System Be able to label the structures of the Excretory System Kidneys Ureters Urethra Urinary Bladder Know the four organs of excretion Kidneys Lungs Liver Skin Lungs As respiration occurs carbon dioxide is produced as a waste product. As the carbon dioxide accumulates in body cells, it eventually diffuses out of the cells & into the bloodstream, which eventually circulates to the lungs. And here, in the alveoli of the lungs, carbon dioxide diffuses from the blood, into the lung tissue, and then leaves the body every time we exhale. Liver Some proteins & other nitrogenous compounds are broken down in the liver. As a result of these reactions, a nitrogenous waste called urea is formed. Largest organ in the body; helps the digestive, excretory and circulatory system Skin As you already know, sweat comes out of pores in your skin. As you may not know, sweat is a mixture of three metabolic wastes: water, salts, & urea. So as you sweat, your body accomplishes two things: 1) sweating has a cooling effect on the body, and 2) metabolic wastes are excreted Kidneys Three of the four major metabolic wastes produced by the body are filtered from the blood by the kidneys. They are water, salts, & urea (the 4th, carbon dioxide, is excreted by the lungs, remember?). These are the same three wastes that sweat glands filter & excrete. So, yes, sweat & urine are made basically from the same ingredients (except in different concentrations). Review (answer is liver, lungs, kidneys or skin) 1. excretes salts from its surface 2. responsible for excreting carbon dioxide 3. has functional units called nephrons 4. produces both urea & bile 5. organ in which blood loses urea & reabsorbs glucose and amino acids 6. removes old red blood cells from the circulatory system 7. maintains homeostasis by removing body heat, water, & other wastes 8. adds or removes glucose from the blood as necessary 1. excretes salts from its surface - SKIN 2. responsible for excreting carbon dioxide LUNGS 3. has functional units called nephrons KIDNEYS 4. produces both urea & bile - LIVER 5. organ in which blood loses urea & reabsorbs glucose and amino acids KIDNEYS 6. removes old red blood cells from the circulatory system - LIVER 7. maintains homeostasis by removing body heat, water, & other wastes - SKIN 8. adds or removes glucose from the blood as necessary - LIVER 9. Which is the correct pathway for the elimination of urine? a) urethra, ureter, bladder, kidney b) kidneys, urethra, bladder, ureter c) bladder, ureters, kidney, urethra d) kidneys, ureters, bladder, urethra 9. Which is the correct pathway for the elimination of urine? a) urethra, ureter, bladder, kidney b) kidneys, urethra, bladder, ureter c) bladder, ureters, kidney, urethra d) kidneys, ureters, bladder, urethra 10. A blockage in a ureter would Interfere with: a) urine entering the kidney b) urine entering the bladder c) urine leaving the body d) urea entering the kidney 10. A blockage in a ureter would Interfere with: a) urine entering the kidney b) urine entering the bladder c) urine leaving the body d) urea entering the kidney 11. In addition to water, the principal components of urine are: a) amino acids & fatty acids b) urea & salts c) ammonia & bile d) hydrochloric acid & urea 11. In addition to water, the principal components of urine are: a) amino acids & fatty acids b) urea & salts c) ammonia & bile d) hydrochloric acid & urea Resources Textbook & Workbook (Section 13-3) Activity: The Kidneys Activity: Urine Analysis Notes: Excretory System