The following enzyme is responsible for thirst mechanism during dehydration?
(A) ADH (B) Noradrenaline (C) Epinephrine (D) Dopamine
(A) Ans. A. ADH* Because, arginine vasopressin (AVP) also known as antidiuretic hormone, cannot reduce water loss below a ceain minimum level obligated by urinary solute load and evaporation from skin and lungs, a mechanism for ensuring adequate intake is essential for preventing dehydration.* This vital function is performed by the thirst mechanism.* Like AVP, thirst is regulated primarily by an osmostat that is situated in the anteromedial hypothalamus and is able to detect very small changes in the plasma concentration of sodium and ceain other effective solutes.