intestine anatomy macro view

intestine anatomy macro human organ biology medical science health digestive system tissue cell microscopic research study body structure physiology gastrointestinal tract bowel colon small large muscles blood vessels lymph nodes nerves epithelium lamina propria submucosa muscularis serosa mucosa submucosal plexus myenteric peristalsis absorption digestion secretion inflammation disease illness treatment view close-up showing intricate structure generative