Which of the Following Statements Concerning the Medullary Vertical Osmotic

question 113

Multiple Choice

Which of the following statements concerning 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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