Excretion of dilute urine requires ________.
A) relative permeability of the distal tubule to water
B) impermeability of the collecting tubule to water
C) transport of sodium and chloride ions out of the descending nephron loop
D) the presence of ADH

Question

Quizplus · Accepted Answer

The impermeability of the collecting tubule to water is necessary for the excretion of dilute urine. This means that water cannot be reabsorbed back into the body from the urine in the collecting ducts. As a result, a greater volume of urine is produced with a lower concentration of solutes. The other options (A, C, D) are not necessary for the excretion of dilute urine. Relative permeability of the distal tubule to water can affect the final urine concentration, but not the production of dilute urine. Transport of sodium and chloride ions out of the descending nephron loop and the presence of ADH affect the production of concentrated urine.

Excretion of Dilute Urine Requires ________