Urinary system

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Urinary system

  1. 1. Urinary System
  2. 2. Organs <ul><li>Kidneys </li></ul><ul><li>Paired ureters </li></ul><ul><li>Urinary Bladder </li></ul><ul><li>Urethra </li></ul>http://static.howstuffworks.com/gif/define-kidneys-and-urinary-system-1.jpg
  3. 3. Kidneys <ul><li>Extend from the T12 to L3 vertebrae </li></ul><ul><li>Right is slightly lower because of the liver </li></ul><ul><li>12cm long and </li></ul><ul><li>6 cm wide </li></ul>http://www.engin.umich.edu/~cre/web_mod/viper/pics/kidneys2.bmp
  4. 4. Kidneys and Weight Loss <ul><li>Rapid weight loss causes fat around kidneys to dwindle </li></ul><ul><li>Kidneys drop to a lower position (ptosis) </li></ul><ul><li>Ureters become kinked </li></ul><ul><li>Urine cannot pass through the ureters- it backs up and can cause kidney damage </li></ul>
  5. 5. Nephrons <ul><li>The structural and functional units of the kidneys </li></ul><ul><li>Form urine </li></ul>http://www.auburn.edu/academic/classes/zy/hist0509/image/nephron_colorfinal.jpg
  6. 6. Urine Formation <ul><li>Glomerular filtration </li></ul><ul><li>Tubular reabsorption </li></ul><ul><li>Tubular secretion </li></ul>http://www.mhhe.com/biosci/ap/dynamichuman2/content/gifs/0178A.gif
  7. 7. Urine <ul><li>1.0 to 1.8 liters is produced every 24 hours </li></ul><ul><li>Contains nitrogenous waste and unneeded substances </li></ul><ul><li>More solutes = deeper color </li></ul><ul><li>Usually slightly acidic </li></ul><ul><li>Sterile </li></ul>
  8. 8. Urinary Bladder <ul><li>Stores urine temporarily </li></ul><ul><li>Bladder wall contains three layers of smooth muscle </li></ul><ul><li>Collapses when empty </li></ul>
  9. 9. Urethra <ul><li>Carries urine from the bladder to outside the body </li></ul><ul><li>Length and relative function differ by sex </li></ul><ul><li>Female: 3-4 cm: conduct urine to the body exterior </li></ul><ul><li>Male: 20cm: urine out of the body and ejects sperm from the body </li></ul>

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