Patients with diabetes mellitus have frequent urination and increased thirst because
A) less water passes from the glomerulus to the glomerular capsule.
B) more water is driven from the glomerulus to the glomerular capsule than normal.
C) more salt is reabsorbed at the proximal convoluted tubule.
D) an increase in sodium ions causes more nerve stimulation and triggers urination.
E) increased glucose in the urine increases its osmolarity and less water is reabsorbed by blood.

Question

Quizplus · Accepted Answer

In diabetes mellitus, increased glucose in the urine increases its osmolarity. This means that the urine will have a higher concentration of solutes than the blood. As a result, less water is reabsorbed by the blood, leading to increased urine output and dehydration. This dehydration triggers thirst as the body attempts to replace the lost fluids.

Patients with Diabetes Mellitus Have Frequent Urination and Increased Thirst