The main function of the liver is to filter and process blood from the digestive tract. It plays a vital role in metabolizing nutrients, detoxifying harmful substances, and producing bile to aid in digestion. The liver also stores vitamins and minerals and can convert excess glucose into glycogen for storage. In addition, it helps regulate blood sugar levels and synthesizes proteins, including those involved in blood clotting. Its numerous functions highlight the liver's importance in maintaining overall health, metabolism, and homeostasis in the body.