A patient comes to your medical practice with complaints of low urine output (not peeing).  You use inulin to calculate the glomerular filtration rate (GFR) using the following information: Plasma level (P – constant over 24 hours): 10 mg/mL inulin.  Urine sample (U): 144 mg inulin/mL urine. Urine formation (V): 10 mL/min.   Using the fromula GFR=V  ✕ U/P, you calculate a GFR of ... A) 144mL/min.. B) 14400 mL/min. C) 144 min./mL. D) 144 g mannitol/min.

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