Why Does the Peritubular Fluid of the Renal Medulla Contain

question 111

Multiple Choice

Why does the peritubular fluid of the renal medulla contain an unusually high solute concentration?

• A) The cells of the juxtaglomerular complex secrete the hormone erythropoietin and the enzyme renin.
• B) The collecting system reabsorbs water and reabsorbs or secretes sodium, potassium, hydrogen, and bicarbonate ions.
• C) The cells of the proximal convoluted tubule reabsorb organic nutrients, plasma proteins, and ions from the tubular fluid.
• D) The ascending limb of the nephron loop actively transports sodium and chloride ions out of the tubular fluid.
• E) The filtration slits between the slender processes of the podocytes prevent the passage of blood cells and most plasma proteins.

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