MCAT Question A Day - 8/4/14 - Answer!
Long loops of Henle on juxtamedullary nephrons allow for greater concentration of urine. For an individual with highly concentrated urine, filtrate entering the loop of Henle is likely to be:
A. more concentrated than filtrate exiting the loop Henle.
B. less concentrated than filtrate exiting the loop of Henle.
C. more voluminous than filtrate exiting the loop of Henle.
D. less voluminous than filtrate exiting the loop of Henle.
A is correct. The loop of Henle concentrates the medulla via a net loss of solute to the medulla. This process is critical to the function of other parts of the nephron; a medulla with a high concentration of solute allows for the passive absorption of water from the filtrate in other areas of the nephron.
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A is correct. The loop of Henle concentrates the medulla via a net loss of solute to the medulla. This process is critical to the function of other parts of the nephron; a medulla with a high concentration of solute allows for the passive absorption of water from the filtrate in other areas of the nephron.
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