How are the blood levels of vasopressin and aldosterone in a dehydrated individual likely to compare with those of a healthy individual?

A.  Vasopressin and aldosterone levels are likely to be lower in a dehydrated individual.

B.  Vasopressin and aldosterone levels are likely to be higher in a dehydrated individual.

C.  Vasopressin levels are likely to be higher while aldosterone levels are likely to be lower in a dehydrated individual.

D.  Vasopressin levels are likely to be lower while aldosterone levels are likely to be higher in a dehydrated individual.

B is correct. Vasopressin is antidiuretic hormone increasing water retention. ADH levels will be raised in response to dehydration. Aldosterone is a mineral corticoid released by the adrenal cortex in response to low blood pressure. In a severely dehydrated person, blood volume would be low, likely resulting in diminished blood pressure. Aldosterone levels will rise in response to the low blood pressure.

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