What is the differencence between active and passive reabsorption Give

The two modes of Tubular reabsorption are:

(i) Active absorption: It involves expenditure of energy. E.g., glucose, amino

acids, Na⁺, K⁺ and Ca⁺⁺

(ii) Passive absorption: It does not involve any energy expenditure, but follows

concentration gradient, e.g., water by osmosis, Cl^- ions.