part_of part of has part develops from anatomical structure abdomen endocrine system digestive system liver An exocrine gland which secretes bile and functions in metabolism of protein and carbohydrate and fat, synthesizes substances involved in the clotting of the blood, synthesizes vitamin A, detoxifies poisonous substances, stores glycogen, and breaks down worn-out erythrocytes[GO]. iecur jecur exocrine system exocrine gland immune system hepatobiliary system liver primordium endoderm-derived structure septum transversum liver lobule abdomen element digestive system gland liver bud