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Question

(B) $Vasopressin$ (also known as $ADH$) reduces the excretion of water in urine by promoting its reabsorption from the $Distal$ $Convoluted$ $Tubule$

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$A$ reduction in vasopressin secretion from posterior pituitary

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(B) $Vasopressin$ (also known as $ADH$) reduces the excretion of water in urine by promoting its reabsorption from the $Distal$ $Convoluted$ $Tubule$ $(DCT)$ and collecting ducts of the nephron.When $vasopressin$ is released in lesser amounts,the reabsorption of water decreases,leading to excessive loss of water through urine,a condition known as diabetes insipidus.This results in increased thirst (polydipsia) and frequent urination,while the blood glucose level remains normal because insulin secretion is unaffected.

$A$ person passes much urine and drinks much water but his blood glucose level is normal. This condition may be the result of

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