Copyright@ The McGraw-Hill Companies, Inc. Permission required for reproduction or display Blood flo Hepatic ++++ portal vein Absorption Secretion Mouth Food and water 鸟知:mn9 Feces Esophagus Rectum Small intestine Stomach Colon Motility 消化道四大过程 digestion, secretion, absorption and motility消化道四大过程: digestion, secretion, absorption, and motility