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22. What stimulus below causes the release of vasopressin (antidiuretic hormone) from the hypothalamus? A. decreased plasma o

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As far as vasopressin or ADH releases, volume of tubular water and permeability of urea increases. So water reabsorbed.. And volume of urine or excretion of urine decreases. Which causes Increase in osmolarity of blood. And also decrease the extracellular fluid vloume.So in our case as soon as ADH releases extra cellular fluid vloume decreases.

Hence option B is correct.

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