Diabetes insipidus can be caused by
A) decreased levels of insulin.
B) decreased numbers of insulin receptors.
C) failure of the kidneys to respond to ADH.
D) increased numbers of ADH receptors.
E) increased levels of ADH.

Question

Quizplus · Accepted Answer

Diabetes insipidus is caused by failure of the kidneys to respond to ADH (antidiuretic hormone), which leads to excessive urine output and thirst. ADH, also known as vasopressin, regulates the amount of water in the body by controlling the amount of urine produced. When the kidneys fail to respond to ADH, water is not reabsorbed into the bloodstream and instead is excreted in the urine, causing dehydration and thirst. Decreased levels of insulin (choice A) and decreased numbers of insulin receptors (choice B) are characteristic of type 1 and type 2 diabetes mellitus, which are different from diabetes insipidus. Increased numbers of ADH receptors (choice D) and increased levels of ADH (choice E) would lead to increased water reabsorption and would not cause diabetes insipidus.

Diabetes Insipidus Can Be Caused by