During a Mountain Climb, a 23-Year-Old Hiker Loses a Foothold

During a mountain climb, a 23-year-old hiker loses a foothold and falls several feet. He is not seriously injured, but he does lose his backpack. He walks for 8 hours in the heat without water, and by the time he reaches a shelter, he is extremely thirsty. Which of the following nephron segments' fluid is most likely to be hypoosmotic in this individual?

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

Correct Answer:

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