A researcher is studying a nephrotoxic drug that selectively destroys the simple cuboidal brush border epithelium in the kidneys of a mammalian model. Which of the following physiological processes will be most severely and immediately impaired as a result of this tissue damage?

Step-by-step solution

The simple cuboidal brush border epithelium is the characteristic histological lining of the proximal convoluted tubule (PCT). The brush border significantly increases the surface area for reabsorption. According to NCERT, the PCT is responsible for the reabsorption of nearly all essential nutrients and 70-80 % of electrolytes and water. Therefore, destruction of this specific epithelium will severely impair this massive bulk reabsorption. Conditional reabsorption of Na ⁺ and water occurs in the distal convoluted t