What is the primary function of the liver?

The primary function of the liver is filtering blood, which involves detoxifying harmful substances, synthesizing proteins, and producing biochemicals necessary for digestion. The liver plays a critical role in metabolic processes and helps maintain homeostasis. One of its functions includes the removal of waste materials from the blood, particularly those created by digestion, such as ammonia and bilirubin, and processing nutrients absorbed from the gastrointestinal tract.

Although the liver does perform other functions—such as storing vitamins and minerals, producing bile for digestion, and regulating blood glucose levels—its identification as a waste-removing organ is central to understanding its role in maintaining overall health and function. The liver's ability to filter and cleanse the blood is essential in preventing the accumulation of toxins and waste products that could lead to various health issues.