The release by ADH takes place from hypothalamus when

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urine becomes hypertonic

blood volume increases

the osmolarity of blood increases

the osmolarity of blood decreases

answer is A.

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Detailed Solution

Osmoreceptors in the body are activated by changes in blood volume, body fluid volume and ionic concentration. An excessive loss of fluid from the body can activate these osmoreceptors which stimulate the hypothalamus to release antidiuretic hormone (ADH) or vasopressin from the neurohypophysis. ADH facilitates water reabsorption from latter parts of the tubule, thereby preventing diuresis.

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