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Kangaroo rats are better able to concentrate urine than humans are. It would be expected that, compared to the nephrons of human kidneys, the nephrons of kangaroo-rat kidneys would have

Kangaroo rats are better able to concentrate urine than humans are. It would be expected that, compared to the nephrons of human kidneys, the nephrons of kangaroo-rat kidneys would have Correct Answer longer loops of Henle

C The loop of Henle is responsible for the concentration of urine. The longer the loop of Henle, the more water would be reabsorbed, which would make the filtrate more concentrated. Eliminate (D); if the loop of Henle were longer, the collecting ducts may or may not also be longer. Choice is also incorrect; if the walls of the nephrons were thicker and impermeable, water would not be conserved.

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