Which of the following is incorrect about PCT?

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Lined with simple cuboidal brush border epithelium.

All essential nutrient and 70 to 80 per cent of the electrolyte and water are reabsorbed here.

It helps in the PH maintenance of body fluid by the selective secretion of $H^{+}$ ion and by the absorption of ${HCO}_{3}^{-}$ .

It does not help in the maintenance of ionic balance of body fluid.

answer is D.

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Detailed Solution

PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption. Nearly all of the essential nutrients, and 70-80 per cent of electrolytes and water are reabsorbed by this segment.

PCT helps to maintain ionic balance of the body fluids.

PCT also helps to maintain the pH by selective secretion of hydrogen ions, ammonia and potassium ions into the filtrate and by absorption of HCO₃^– from it.

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