The plasma clearance of a substance can be used to calculate the glomerular filtration rate (GFR) if that substance is freely filtered at the glomerulus and
a. secreted and reabsorbed by the tubules.
b. neither reabsorbed nor secreted by the tubules.
c. secreted by the tubules.
d. reabsorbed by the tubules.
e. none of these answers.
B
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