Question

protein ______ .
a is found in the filtrate and is reabsorbed, but still occurs in the urine
b does not leave the blood plasma under normal conditions
c is filtered and reabsorbed totally
d is filtered, but not reabsorbed

Explanation:

To solve this, we analyze each option based on renal physiology (filtration and reabsorption of proteins):

• Option A: Normal urine has no protein (except in pathology), so this is incorrect.
• Option B: Under normal conditions, large plasma proteins (like albumin, globulins) are too big to pass through the glomerular filtration barrier, so they don’t leave blood plasma. This matches renal physiology.
• Option C: Proteins are not filtered (or only trace amounts of small proteins are), so “filtered and reabsorbed totally” is wrong.
• Option D: Proteins are not filtered (or minimally), and reabsorption of filtered small proteins occurs, so this is incorrect.

Answer:

B. does not leave the blood plasma under normal conditions