The descending segment of the loop of Henle primarily allows for:
a. sodium secretion.
b. potassium secretion.
c. hydrogen ion reabsorption.
d. water reabsorption.
ANS: D
The descending segment of the loop of Henle is highly permeable to water and so is involved in the reabsorption of water. The descending segment of the loop of Henle is not associated with the reabsorption of hydrogen ions or the secretion of either sodium or potassium.
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