Proximal tubule is involved in reabsorption from blood to filtrate while Distall tubule is also involed in secretion from blood to filtrate.
Explanation:
Proximal Tubule;
It reabsorbs the important nutrients such as water, sodium, potassium, calcium, glucose, aminoacid etc. from the filtrate and send them back into the bloodstream.
Distal tubule;
Although distal tubule is involved in reabsorption of nutrients such as calcium, sodium chloride but it is also in secretion of blood wastes such as drugs into the filtrate. It also help in maintaining the pH of blood by secreting the protons into filtrate and absorbing the bicarbonate ions.
