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

Question

Quizplus · Accepted Answer

Excretion of dilute urine requires the collecting tubule to be impermeable to water, which prevents water from being reabsorbed and thus results in a larger volume of more dilute urine. The presence of ADH (antidiuretic hormone) actually makes the collecting ducts more permeable to water, which would concentrate the urine, not dilute it. The relative permeability of the distal tubule to water and the transport of sodium and chloride ions out of the descending nephron loop are involved in the regulation of urine concentration but do not directly result in the excretion of dilute urine.

Excretion of Dilute Urine Requires ________