Which Statement Is Incorrect

question 24

Multiple Choice

Which statement is incorrect?

• A) The loops of Henle of juxtamedullary nephrons are responsible for establishing a vertical osmotic gradient in the interstitial fluid of the renal medulla by countercurrent multiplication.
• B) The active NaCl pump of the ascending limb of the loop of Henle can establish a 1,200 mOsm/liter concentration difference between the ascending and descending limbs at any given horizontal level.
• C) By means of countercurrent exchange, the vasa recta preserve the vertical osmotic gradient while supplying blood to the medullary tissue.
• D) The collecting tubules of all nephrons utilize the driving force of the vertical osmotic gradient to accomplish variable H₂O reabsorption under the control of vasopressin, which governs their permeability.
• E) The filtrate is isotonic as it enters the loop of Henle, hypertonic at the tip of the loop of Henle, and hypotonic as it leaves the loop of Henle.

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