Question

What is the difference between proximal tubule and distal tubule? Why should there be a difference? Can't there just be one tubule?

Answer 1

Functions of PCT :-
→ The cells present in this part have brush boarder which is capable of absorption
→ PCT receives primary urine from glomerulus. It regulates excretion of urine by absorbing excess water from primary urine.
→ Small amounts of tubular secretion also takes place in the proximal convoluted tubule.

Functions if DCT :-
→ Distal convoluted tubule is the highly coiled part found in medulla of the kidney.
→ After reabsorption of water the urine travels through loop of the Henle into Distal convoluted tubule. Here water and salts are excreted. It maintains proper concentration and pH of the urine.
→ The secretion if wastes like extra salts,ions of K+ ,Na+,Cl - and H+ takes place in distal convoluted tubule.