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Question

If ADH level of blood is less,

A
Volume of urine increases
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B
Volume of urine decreases
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C
Volume of urine is normal
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D
Volume of urine is unaffected
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Solution

The correct option is A Volume of urine increases
Low levels of the anti-diuretic hormone (ADH) will cause the kidneys to excrete too much water. Urine volume will increase leading to dehydration and a fall in blood pressure. ADH is required for the absorption of water by the kidneys; in its absence, the kidneys will not reabsorb water and the water is lost in the form of urine, so the volume of urine increases. Low levels of the anti-diuretic hormone may indicate damage to the hypothalamus or pituitary gland or primary polydipsia (compulsive or excessive water drinking). Thus, the correct answer is option A.

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