Urea
A) is a waste product resulting from the breakdown of protein
B) is passively reabsorbed at the end of the proximal tubule down a urea concentration gradient created by the osmotic-induced reabsorption of water from the proximal tubule
C) recycling between the late portion of the collecting tubule and the long loops of Henle contributes to medullary hypertonicity
D) is found in the blood, filtrate, and urine
E) all of these

Question

Quizplus · Accepted Answer

All of these statements are true. Urea is a waste product resulting from the breakdown of protein, it is reabsorbed passively at the end of the proximal tubule down a concentration gradient created by the osmotic-induced reabsorption of water from the proximal tubule, recycling between the late portion of the collecting tubule and the long loops of Henle contributes to medullary hypertonicity, and it can be found in the blood, filtrate, and urine.