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Question

Hyposecretion of ADH has this effect on urine volume and concentration.

A
Increased volume and decreased concentration
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B
Increased volume and increased concentration
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C
Decreased volume and decreased concentration
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D
Decreased volume and increased concentration
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Solution

The correct option is A Increased volume and decreased concentration
Antidiuretic hormone (ADH), also called vasopressin, is secreted by the posterior pituitary gland in response to an increase in the osmotic concentration of the blood plasma. An increase in the osmotic concentration of the blood stimulates the posterior pituitary gland to secrete ADH, which promotes water retention by the kidneys and excretion of highly concentrated urine. When ADH is missing (hyposecretion of ADH), the kidneys do not retain water and excessive quantities of urine are produced (low concentration). This is why the consumption of alcohol, which inhibits ADH secretion, leads to frequent urination.

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