The cells of proximal tubule develop microvilli and have brushy border. The number of microvilli per square micron in human being is

150

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500

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3000

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3500

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Solution

The correct option is A 150
Proximal convoluted tubule is about 14 millimeters in length. The wall of the tubule is made up of cuboidal epithelial cells, which have microvilli. Each cell has about 150 microvilli per square micron. Each microvillus is about 1 micron in length. The microvilli together form a brush border region.

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