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Question

The hormone involved in the active water reabsorption in renal tubules

A
Anti-diuretic hormone
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B
Vasopressin
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C
Both A and B
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D
Adrenaline
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Solution

The correct option is C Both A and B
ADH regulates the water balance in body by decreasing the excretion of free water from kidney (antidiuretic effect). It does so by increasing the permeability of ADH responsive cells in linings of distal convoluted tubules and collecting ducts of renal nephrons.
ADH is also known as vasopressin owing to its role in vasoconstriction.
Adrenaline is an emergency hormone secreted by adrenal medulla under emergency condition to prepare the body for flight or fight response. It decreases the ADH secretion and thereby causes increased frequency of micturition during stress conditions.
Therefore, the correct answer is option C.

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