Gastric phase Mechanisms: Distension of gastric fundus body initiating vagovagal local plexus reflexes Distension of pylorus initiating a release of gastrin through intrinsic plexus Chemical stimulation of G cells initiaying a release of gastrin Experiment:Pavlov pouch Characteristics: Large quantity (60%) High acidity digestive power Gastric phase Mechanisms: Distension of gastric fundus & body initiating vagovagal & local plexus reflexes Distension of pylorus initiating a release of gastrin through intrinsic plexus Chemical stimulation of G cells initiaying a release of gastrin Experiment: Pavlov pouch Characteristics: Large quantity (60%) High acidity & digestive power