absorption, assimilation, autacoid, bile, chalone, digestion, digestive secretion, digestive system, endocrine, gall, gastrointestinal tract, hormone, ingestion, intestinal juice, liver, mucus, pancreas, pancreatic digestion, pancreatic juice, predigestion, prostatic fluid, rheum, saliva, salivary digestion, salivary glands, salivary secretion, secondary digestion, semen, sperm, tears, thyroxin