NEETZoologyExcretory Products and their Elimination
What is the function of Proximal Convoluted Tubule (PCT) in urine formation?
Options
- AMaintenance of high osmolarity of medullary interstitial fluid
- BReabsorption of essential nutrients, electrolytes and water
- CConditional reabsorption of Na⁺ and water
- DMaintenance of pH and ionic balance of body fluids
Correct answer
D. Maintenance of pH and ionic balance of body fluids
Step-by-step solution
Proximal Convoluted Tubule (PCT): 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 percent of electrolytes and water are reabsorbed by this segment. PCT also helps to maintain the pH and ionic balance of the body fluids by selective secretion of hydrogen ions and ammonia into the filtrate and by absorption of HCO3– from it. Henle’s Loop: Reabsorption is minimum in its ascending limb. However, this region plays