3. Basic types of movements in digestive tract mastication and swallowing: Tonic contraction: a constant level of contraction, without regular period of relaxation Peristaltic contraction: a series of coordinated sequential contraction.囚 Migration motor complex (MMC Mass movement Segmentation contraction: alternate contraction and relaxation of a section of intestine
3. Basic types of movements in digestive tract mastication and swallowing: Peristaltic contraction: a series of coordinated sequential contraction. Tonic contraction: a constant level of contraction, without regular period of relaxation Segmentation contraction: alternate contraction and relaxation of a section of intestine Migration motor complex (MMC) Mass movement
Receptive relaxation: stimulation of food on pharynx and esophagus produce relaxation of the lower esophageal sphincter and the orad stomach
Receptive relaxation: stimulation of food on pharynx and esophagus produce relaxation of the lower esophageal sphincter and the orad stomach
Peristalsis Peristalsis contraction relaxation □
contraction relaxation Peristalsis
Segmental contractions are responsible for mixing Segmentation contraction No net forward movement
Segmentation contraction
II. Secretory function of digestive glands Secretion is the addition of fluids, enzymes and mucus from the digestive glands to the lumen of gastrointestinal tract. Main digestive gland salivary glands saliva, 1500 ml/day gastric gland--gastric juice, 2500 ml/day exocrine cells of pancreas--pancreatic juice, 1500 ml/day liver bile, 500 m/day
Ⅲ. Secretory function of digestive glands Main digestive gland: Secretion is the addition of fluids, enzymes and mucus from the digestive glands to the lumen of gastrointestinal tract. salivary glands saliva, 1500 ml/day gastric gland gastric juice, 2500 ml/day exocrine cells of pancreas pancreatic juice, 1500 ml/day liver bile, 500 ml/day