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Excretory System


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Excretory System

  1. 1. Excretory System
  2. 2. Excretion <ul><li>Excretion is the removal of wastes </li></ul><ul><li>Wastes from: </li></ul><ul><ul><li>Cellular respiration </li></ul></ul><ul><ul><li>Digestion of food </li></ul></ul><ul><ul><li>Cellular activities </li></ul></ul>
  3. 3. Skin <ul><li>Your skin is very important to the excretory system. </li></ul><ul><li>Excretes excess </li></ul><ul><ul><li>Water </li></ul></ul><ul><ul><li>Urea </li></ul></ul><ul><ul><li>Heat </li></ul></ul>
  4. 4. What is Urea? <ul><li>A common metabolic cellular waste product is ammonia. </li></ul><ul><li>It can raise the pH of blood. </li></ul><ul><li>The human body can combine ammonia and excess CO2 to make Urea. </li></ul><ul><li>Urea is very soluble in water, making it an easy way to excrete excess nitrogen </li></ul>
  5. 5. Lungs? <ul><li>The lungs are an important organ of the excretory system </li></ul><ul><li>But what wastes do they get rid of? </li></ul>
  6. 6. Carbon Dioxide <ul><li>Carbon Dioxide is a waste product of cellular respiration </li></ul><ul><li>It makes the blood acidic </li></ul><ul><li>Our body needs to get rid of it </li></ul>
  7. 7. Diffusion <ul><li>We have no special process for CO2 removal </li></ul><ul><li>Rely on simple diffusion </li></ul><ul><li>Alveoli </li></ul><ul><ul><li>High to low concentration </li></ul></ul><ul><li>Lungs </li></ul>
  8. 8. Liver <ul><li>Liver is responsible for detoxification of the body </li></ul><ul><li>It converts ammonia to urea </li></ul>
  9. 9. Cirrhosis <ul><li>Scarring of the liver </li></ul><ul><li>Usually caused by alcoholism </li></ul>
  10. 10. Large Intestines <ul><li>Removal of water from solid wastes </li></ul><ul><li>Excretion of solid wastes </li></ul><ul><li>The act of defecation is not considered a part of excretory system </li></ul>
  11. 11. Kidneys <ul><li>Kidneys are the most important organ of the excretory system </li></ul><ul><li>Regulate pH of the blood </li></ul><ul><li>Remove excess water, and urea to create urine </li></ul>
  12. 12. Urinary System <ul><li>Kidneys feed Ureter </li></ul><ul><li>Ureter connects to Bladder </li></ul><ul><li>Bladder stores urine </li></ul><ul><li>Excreted through Urethra </li></ul>
  13. 13. Excretion and Homeostasis <ul><li>Excretion is essentially a process of maintaining homeostasis </li></ul><ul><ul><li>To maintain a constant internal environment all metabolic wastes need to be removed </li></ul></ul>