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.

---

Definitions:

Metamorphism

The process by which a rock's structure or mineralogy is transformed due to extreme pressure and temperature conditions, without the rock melting.

Fault Scarp

A steep slope or cliff formed as a result of movement along a fault line, representing the visible expression of faulting.

Joint Set

A group of parallel, evenly spaced fractures or cracks in rocks, often resulting from the same stress regime.

Asymmetric Fold

A type of fold in the Earth’s strata that has one limb that is steeper than the other due to differential stresses.