Question

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

• A. A reduction in insulin secretion from pancreas
• B. A reduction in vasopressin secretion from posterior pituitary
• C. A fall in the glucose concentration in urine
• D. An increase in secretion of glucagon

Answer 1

The correct option is B A reduction in vasopressin secretion from posterior pituitary

Arginine vasopressin (AVP), also known as antidiuretic hormone, acts on the kidneys to regulate the volume and osmolality of the urine. Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into the circulation. In the absence of antidiuretic hormone, the collecting ducts are virtually impermeable to water, and it flows out as urine.