peristalsis movement poster

stomach peristalsis reflux neuropathy vagus sphincter esophagus gastroparesis vector gastritis gastroesophageal nervosa test system malnutrition peptic nerve peristaltic contraction pyloric food open organ intestinal motility relaxation muscle propagate circular gut digestive tract human gastrointestinal tissue fluid movement push physiology reflex bolus stretch through illustration emptying diagram eating flat gastric graphic