Which Statement About the Medullary Vertical Osmotic Gradient Is Incorrect

question 306

Multiple Choice

Which statement about the medullary vertical osmotic gradient is incorrect?

• A)Juxtamedullary nephrons create the gradient through countercurrent multiplication.
• B)Vasa recta supply blood to the medulla while conserving the gradient.
• C)Collecting tubules of juxtamedullary nephrons, but not cortical nephrons, descend through the gradient before emptying into the renal pelvis.
• D)The gradient permits excretion of urine of differing concentrations by means of vasopressin-controlled, variable H2O reabsorption from the final tubular segments.
• E)None of the above statements are incorrect.

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