Ch 15 Excretory Sys Overview

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Ch 15 Excretory Sys Overview

  1. 1. Chapter 15 The Urinary System
  2. 2. <ul><li>Functions of the Urinary System </li></ul><ul><li>1. Elimination of waste </li></ul><ul><ul><li>Nitrogenous wastes </li></ul></ul><ul><ul><li>Toxins </li></ul></ul><ul><ul><li>Drugs </li></ul></ul><ul><li>2. Regulates homeostasis </li></ul><ul><ul><li>Water balance </li></ul></ul><ul><ul><li>Electrolytes </li></ul></ul><ul><ul><li>Acid-base balance in the blood </li></ul></ul><ul><ul><li>Blood pressure </li></ul></ul><ul><ul><li>RBC production </li></ul></ul><ul><ul><li>Activation of vit. D </li></ul></ul>
  3. 3. <ul><li>Organs of the Urinary system </li></ul><ul><li>Kidneys </li></ul><ul><li>Ureters </li></ul><ul><li>Urinary bladder </li></ul><ul><li>Urethra </li></ul>
  4. 4. <ul><li>Location of the Kidneys </li></ul><ul><li>Against dorsal wall </li></ul><ul><li>Right lower than left </li></ul><ul><li>Attached to ureters, renal blood vessels, & nerves at renal hilus </li></ul><ul><li>Atop kidney is adrenal gland </li></ul>
  5. 5. <ul><li>Regions of the Kidney </li></ul><ul><li>Renal cortex – outer region </li></ul><ul><li>Renal medulla – inside the cortex </li></ul><ul><li>Renal pelvis – inner collecting tube </li></ul>
  6. 7. <ul><li>Nephrons </li></ul><ul><li>Structural and functional units of the kidneys </li></ul><ul><li>Forms urine </li></ul><ul><li>Main structures </li></ul><ul><li>a. Glomerulus </li></ul><ul><li>b. Renal tubule </li></ul>
  7. 8. <ul><li>Glomerulus </li></ul><ul><li>Glomerulus sits within a glomerular capsule (1 st part of the renal tubule) </li></ul><ul><li>Specialized capillary bed </li></ul><ul><li>Arterioles on both sides (maintains high pressure) </li></ul><ul><ul><li>Large afferent arteriole </li></ul></ul><ul><ul><li>Narrow efferent arteriole </li></ul></ul>
  8. 9. <ul><li>Renal Tubule </li></ul><ul><li>Glomerular (Bowman’s) capsule </li></ul><ul><li>Proximal convoluted tubule </li></ul><ul><li>Loop of Henle </li></ul><ul><li>Distal convoluted tubule </li></ul>
  9. 10. <ul><li>Urine Formation </li></ul><ul><li>Filtration </li></ul><ul><li>Reabsorption </li></ul><ul><li>Secretion </li></ul>
  10. 11. <ul><li>Filtration </li></ul><ul><li>Nonselective passive process </li></ul><ul><li>Water and solutes smaller than proteins are forced through capillary walls (Filtrate same as blood plasma) </li></ul><ul><li>Blood cells cannot pass out to the capillaries </li></ul><ul><li>Filtrate - collected in glomerular capsule and leaves via the renal tubule </li></ul>
  11. 12. <ul><li>Reabsorption </li></ul><ul><li>Peritubular capillaries reabsorb </li></ul><ul><ul><li>- Some water, Glucose, Amino acids, Ions </li></ul></ul><ul><li>Some passive, most active </li></ul><ul><li>Most reabsorption occurs in proximal tubule </li></ul><ul><li>Nitrogenous waste products </li></ul><ul><ul><li>- Urea </li></ul></ul><ul><ul><li>- Uric acid </li></ul></ul><ul><ul><li>- Creatinine </li></ul></ul><ul><li>Excess water </li></ul>Not Reabsorbed
  12. 13. <ul><li>Secretion </li></ul><ul><li>Materials left in renal tubule move to ureter </li></ul>

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