1. Aldosterone is the main mineral corticoid that acts on renal tubules of kidneys and stimulates the reabsorption of Na+ and water and excretion of K+ and phosphate (PO4)- ions. 2. Helps in maintenance of electrolytes, blood fluid volume, osmotic pressure and blood pressure. 3. Secretion of small amounts of androgenic steroids are also, secreted by adrenal cortex. They help in growth of axial hair, pubic hair and facial hair during puberty.