Renal Physiologists Are Studying How Hydration Status Affects the Mechanisms

question 62

Multiple Choice

Renal physiologists are studying how hydration status affects the mechanisms of urine concentration and dilution in humans.  To do this, they developed a technique in experimental animals that permits sampling of tubular fluid in different parts of the nephron.  A tubular fluid sample with an osmolarity of 110 mOsm/L is obtained from a healthy animal after 12 hours of water deprivation.  Assuming the physiology of this animal mirrors human physiology, which of the following sites along the nephron was most likely sampled?

• A)A
• B)B
• C)C
• D)D

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