relaxin: hormone secreted by the corpus luteum during the last days of pregnancy; relaxes the pelvic ligaments and prepares the uterus for labor
hormone: the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
cholecystokinin: a gastrointestinal hormone that stimulates the secretion of pancreatic enzymes and the contraction and emptying of the gall bladder; its release is stimulated by the presence of fatty acids and amino acids in the small intestine