Which of the Following Correctly Describes Water Movement Across the Epithelial

question 33

Multiple Choice

Which of the following correctly describes water movement across the epithelial cells lining the collecting duct?

• A) Water can permeate the phospholipid bilayer only in the presence of aldosterone.
• B) Water can permeate the apical membrane through aquaporin -2 and the basolateral membrane through aquaporin -3, but aquaporin -2 is only present in the presence of ADH.
• C) Water can permeate the lipid bilayer at all times.
• D) Water can permeate the basolateral membrane through aquaporin -2 and the apical membrane through aquaporin -3, but aquaporin -2 is only present in the presence of aldosterone.
• E) Water can permeate the phospholipid bilayer only in the presence of ADH.

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