What is the function of the ascending loop of Henle?
a. It provides water for reabsorption by the interstitial fluid and capillaries.
b. It loses urea to the renal medulla, helping this tissue to maintain its concentration gradient of solutes.
c. It absorbs some drugs and poisons from surrounding capillaries.
d. It helps maintain the concentration gradient of NaCl in the interstitial fluid, thus increasing water reabsorption.
e. It collects processed filtrate from the nephrons.
Answer: d. It helps maintain the concentration gradient of NaCl in the interstitial fluid, thus increasing water reabsorption.
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