definition imported from uterine cervix Lower, narrow portion of the uterus where it joins with the top end of the vagina. 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]. kidney A paired organ which has the production of urine as its primary function. bone marrow flexible tissue found in the hollow interior of bones. In adults, marrow in large bones produces new blood cells[WP].