Question

The maximum amount of electrolytes and water (70-80%) from the glomerular filtrate is reabsorbed in which part of the nephron?

• A. Ascending limb of loop of Henle
• B. Distal convoluted tubule
• C. Proximal convoluted tubule
• D. Descending limb of loop of Henle

Answer 1

The correct option is C Proximal convoluted tubule

During glomerular filtration in kidneys, ultrafiltration of blood occurs, i.e., almost all the constituents of plasma except proteins pass onto the Bowman’s capsule. Then nearly $99\%$ of the filtrate is reabsorbed by the renal tubules.

Proximal convoluted tubule is lined by simple cuboidal brush border epithelium. Hence, the surface area for reabsorption gets considerably increased. Thus, the proximal convoluted tubule shows maximum reabsorption and nearly all the essential nutrients and $70-80\%$ of electrolytes and water are reabsorbed by this segment.