A 23-Year-Old Hiker Loses a Foothold and Falls Several Feet

A 23-year-old hiker loses a foothold and falls several feet during a mountain climb.  He sustains no major injury but loses his backpack.  He walks in the heat without water for the next 8 hours; by the time he reaches a shelter, he is extremely thirsty.  Fluid from which of the following nephron segments is likely to be the most hypoosmotic in this individual?

A) A
B) B
C) C
D) D
E) E
F) F
G) G

Correct Answer:

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