Following an intense workout your clothes are drenched in sweat. You estimate you lost at least 0.5 L of sweat. Your (similarly sized) friend skipped her workout to donate blood and you found out she donated 0.5 L of plasma. After these activities, which of you will have a greater increase in vasopressin secretion and why?
A. You will have a greater vasopressin secretion because sweat is hypoosmotic to plasma.
B. Your friend will have a greater vasopressin secretion because sweat is isosmotic to plasma.
C. Your friend will have a greater vasopressin secretion because sweat is hyperosmotic to plasma.
D. You will have a greater vasopressin secretion because sweat is hyperosmotic to plasma.
E. Your friend will have a greater vasopressin secretion because sweat is hypoosmotic to plasma.
Answer: A
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