Synthesis and storage. Most of the nutrients consumed are digested and absorbed through the stomach and small intestine, and then synthesized through the action of liver cells into a variety of important substances required by the body. Bile is secreted and fats are digested. Detoxification. The liver transforms toxic substances absorbed into the body or produced during the metabolism of the organism into non-toxic or less toxic substances and accelerates their excretion to protect the organism from toxicity and maintain normal physiological functions. Defensive role. The liver is rich in phagocytes, which can engulf and remove foreign substances from the blood, and is the main component of the body’s defense system. Hematopoietic function. During the embryonic period, hematopoietic function is present, and in certain pathological states, the liver can restore some hematopoietic function.