Q.

Substance X is freely filtered by the glomerulus and is not reabsorbed, nor secreted nor metabolized.
If - serum x concentration = 0.020 mg/ml
renal artery x concentration = 0.020 mg/ml
renal vein x concentration = 0.002 mg/ml
urine x concentration = 14 mg/ml
urine flow = 54 ml/hr
lymphatic x concentration = 0.00001 mg/ml
haematocrit = 0.45

The GFR is:

A. 10.5 ml/min
B. 700 ml/min
C. 11.7 ml/min
D. 630 ml/min
E. 778 ml/min
Answer» D. 630 ml/min
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