Which of These Statements Does NOT Correctly Describe the Countercurrent

question 196

Multiple Choice

Which of these statements does NOT correctly describe the countercurrent system?

• 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 Henle's limb can establish a 200 mOsm/litre 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.

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