Renal excretion mechanismsDownloads

A patient is receiving daily administrations of Compound X. Compound X is freely filtered in the glomeruli and undergoes net secretion in the renal tubules. The majority of this tubular secretion occurs in the proximal tubule. Additional information regarding this patient's renal function and the renal processing of Compound X is included below: Inulin clearance: 120 mL/min Plasma concentration of Inulin: 1 mg/mL PAH clearance: 600 mL/min Plasma concentration of PAH: 0.2 mg/mL Total Tubular Secretion of Compound X: 60 mg/min Net Renal Excretion of Compound X: 300 mg/min Which of the following is the best estimate of the plasma concentration of Compound X in this patient?

On cardiology service rounds, your team sees a patient admitted with an acute congestive heart failure exacerbation. In congestive heart failure, decreased cardiac function leads to decreased renal perfusion, which eventually leads to excess volume retention. To test your knowledge of physiology, your attending asks you which segment of the nephron is responsible for the majority of water absorption. Which of the following is a correct pairing of the segment of the nephron that reabsorbs the majority of all filtered water with the means by which that segment absorbs water?