duodenum, human anatomy set,white background, the first part of the small intestine immediately beyond the stomach, leading to the

abdomen abdominal anatomical anatomy appendix background biology body bowel cecum colon diagram digestion digestive disease duodenum education esophagus gallbladder gastric gastrointestinal health healthy hepatic human ileum illustration internal intestinal intestine intestines isolated jejunum large liver medical medicine organ pancreas pancreatic rectum science scientific set small stomach structure system tract