Question

Diabetes insipidus is a condition in which a person is unable to produce sufficient levels of the hormone ADH. The hormone increases the permeability to water of the second (distal) convoluted tubule and collecting duct in the kidney nephrons. What is produced as a result?

(a) large volumes of concentrated *****

(b) large volumes of dilute *****

(c) small volumes of concentrated *****

(d) small volumes of dilute *****

Answer 1

Correct option: (b) large volumes of dilute urine

Explanation:

If the walls of the collecting duct are waterpermeable, water leaves the ducts to pass into the hyperosmotic surrounding and concentrated is produced. Thus, when there is insufficient ADH, less water is reabsorbed and more dilute is produced in copious amounts.