Normally, concentrations of metabolically important substances, such as glucose, are
A) high in glomerular filtrate, but only found in trace amounts in urine.
B) low in glomerular filtrate, but high in urine.
C) high in both glomerular filtrate and urine.
D) low in both glomerular filtrate and urine.
E) excluded from entering the excretory system altogether.

Question

Quizplus · Accepted Answer

Glucose is normally completely reabsorbed from the glomerular filtrate in the proximal tubule of the nephron. Therefore, it should only be found in trace amounts in urine. Other metabolically important substances, such as electrolytes and waste products like urea, may be present in higher concentrations in urine than in the glomerular filtrate.

Normally, Concentrations of Metabolically Important Substances, Such as Glucose, Are