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Urinary System Tract. Trace a molecule of water starting from the renal artery, into a nephron,...

Urinary System Tract. Trace a molecule of water starting from the renal artery, into a nephron, and ending in the urethra. a. Name each vessel, tubule, etc. that it passes through. b. At what point is this molecule considered part of the blood versus filtrate versus tubular fluid versus urine?

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Answer #1

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A) Pathway of a water molecule through renal circulation and urinary system :

  1. Renal artery (In the blood vessel)
  2. Segmental artery
  3. Interlobal artery
  4. Arcuate artery
  5. Interlobular artery
  6. Afferent arteriole
  7. Glomerulus
  8. Bowman's capsule (In the nephron)
  9. Proximal convoluted tubule
  10. Descending limb of loop of Henle
  11. Ascending limb of loop of Henle
  12. Distal convoluted tubule
  13. Collecting duct
  14. Renal papilla (In urinary tract)
  15. Minor calyx
  16. Major calyx
  17. Renal pelvis
  18. Ureter
  19. Urinary bladder
  20. Urethra

Urine exits the body via external urethral orifice.

B)

The water molecule is considered part of the

  • Blood : From renal artery to the glomerulus
  • Filtrate : In Bowman's capsule
  • Tubular fluid : In renal tubules (from proximal tubule to the collecting duct)
  • Urine : As it enters renal papilla
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