How is the amount of urine produced regulated?

The amount of urine largely depends on the amount of water reabsorbed. The amount of water reabsorbed by the nephron tubule depends on.
(i) The amount of  water in the body .
When water is abundant in the body tissues, large quantities of dilute urine is excreted out. When water is less in quantities in the body tissues, a small quantity of concentrated, with less water content, is excreted.
(ii) The amount of dissolved wastes, especially nitrogenous wastes, like urea and uric acid and salts in the body. When there is more quantity of dissolved wastes in the body, more quantity of water is required to excrete them. So, the amount of urine produced increases. When the amount of these substances in the body is less then less urine is produced.
(iii) The amount of urine produced is also regulated by certain hormones which control the movement of water and Na⁺ ions into and out of the nephrons.