The Microvilli on the Luminal Surface of Each Epithelial Cell

question 27

Multiple Choice

The microvilli on the luminal surface of each epithelial cell in the proximal tubule wall will:

• A) form a brush border that increases absorptive surface area of the entire inner surface of the proximal tubule.
• B) form an electrical gradient that drives the diffusion of negative ions from the filtrate into the interstitial fluid.
• C) participate in the countercurrent mechanism, which allows the contents to flow in opposite directions.
• D) increase the secretory surface area of the entire inner surface of the proximal tubule.

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