The amount of urine is regulated by the kidney. It depends on the following factors:
(i) Quantity of water : When water is excess in the body tissues,the quantity of dilute urine excreted out is high. When water is less in quantity in the body tissues, a small quantity of concentrate urine is excreted.
(ii) Quantity of dissolved wastes : When there is more quantity of dissolved wastes in the body, especially nitrogenous wastes, like urea and uric acid and salts , more quantity of water is required to excrete them. Therefore, the amount of urine produced increases.
(iii) Urine produced also depends on the following factors like hormones(Anti-diuretic hormone (ADH)) and habitat of an entity.