human stomach anatomy digestion, 3d reander

render abdomen acid anatomical biology burning care diagram diet dieting digesting digestion digestive enzymes fluid juices process duodenum eating esophageal esophagus fat food gastric juice mucosa pits gastrointestinal tract healthy human hydrochloric illustration indigestion internal intestine longitudinal medical medicine mucosal lining organ pain proteins pyloric science section sphincter stomach stomache swallowing system ulcer