Throughout most of the distal convoluted tubule, the tubular cells
A) actively transport urea out of the tubular fluid.
B) actively reabsorb organic nutrients, plasma proteins, and ions from the filtrate.
C) reclaim 60-70% of the volume of filtrate at the glomerulus.
D) are impermeable both to water and to solutes.
E) actively transport sodium ions out of the tubular fluid.

Question

Quizplus · Accepted Answer

The distal convoluted tubule actively transports sodium ions out of the tubular fluid. Option A is incorrect because urea is primarily reabsorbed in the medullary collecting ducts. Option B is incorrect because organic nutrients and plasma proteins are mostly reabsorbed in the proximal convoluted tubule. Option C is incorrect because only 10-20% of the original filtrate volume remains by the time it reaches the distal convoluted tubule. Option D is incorrect because the distal convoluted tubule is selectively permeable to some substances, such as ions.

Throughout Most of the Distal Convoluted Tubule, the Tubular Cells