Which Statement About the Medullary Vertical Osmotic Gradient Is Incorrect

question 168

Multiple Choice

Which statement about the medullary vertical osmotic gradient is incorrect?

• A) The loops of Henle of juxtamedullary nephrons establish a medullary vertical osmotic gradient by means of countercurrent multiplication.
• B) The vasa recta enable the medulla to be supplied with blood while conserving the medullary vertical osmotic gradient by means of countercurrent exchange.
• C) The countercurrent system establishes and maintains a medullary vertical osmotic gradient ranging from 300 to 1,200 mOsm/liter.
• D) The collecting tubules of the juxtamedullary nephrons, but not the cortical nephrons, descend through the medullary vertical osmotic gradient before emptying into the renal pelvis.
• E) The medullary vertical osmotic gradient permits excretion of urine of differing concentrations by means of vasopressin-controlled, variable H₂O reabsorption from the final tubular segments.

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