Urea
A) is the waste product with the smallest molecular size in the glomerular filtrate
B) is in greater concentration at the end of the proximal tubule than in other body fluids
C) has a clearance rate greater than GFR
D) is the waste product with the smallest molecular size in the glomerular filtrate and is in greater concentration at the end of the proximal tubule than in other body fluids
E) all of these

Question

Quizplus · Accepted Answer

Urea is the waste product with the smallest molecular size in the glomerular filtrate and is in greater concentration at the end of the proximal tubule than in other body fluids. However, its clearance rate is not greater than GFR as it is reabsorbed by the nephron. Thus, option D is the correct choice.