Which of the following is most directly responsible for concentrating urine in the kidney? A. Loop of Henle B. Proximal convoluted tubule C. Bowman's capsule D. Medulla 2. A scientist is studying a normally functioning nephron in an adult human. He examines the filtrate as it moves through the ascending limb of the loop of Henle. What observation is he most likely to make? A. The filtrate becomes less concentrated as it moves up the loop because the ascending limb is permeable to salt B. The filtrate becomes less concentrated as it moves up the loop because the ascending limb is permeable to water C. The filtrate becomes more concentrated as it moves up the loop because the ascending limb is permeable to salt D. The filtrate becomes more concentrated as it moves up the loop because the ascending limb is permeable to water
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