The digestive system transforms food into energy and nourishment, absorbing what sustains us and releasing what does not.
The digestive system processes ingested food and fluids, breaking them down into usable parts and eliminating waste. Its main functions include:
- Ingestion: receiving food and fluids
- Digestion: breaking down substances into smaller components
- Secretion: releasing enzymes and fluids to aid digestion
- Motility: moving food through the system
- Absorption: transferring nutrients, water, and electrolytes into the blood
- Elimination: removing undigested waste
- Protection + Immunity: maintaining the gut wall and supporting microbial balance
- Transformation + Synthesis: the liver reassembles nutrients into new materials for the body
Primary Organs: Mouth, Esophagus, Stomach, Small Intestine (site of transformation and absorption), Large Intestine (site of elimination, connected to the nervous system), Colon, Rectum, Sphincters. Supporting Organs: Liver, Pancreas, Gallbladder, Appendix. Microbiome & Supportive Tissues: Flora (gut microbiota), Gut wall: mucosa, submucosa, circular smooth muscle fibers, longitudinal smooth muscle fibers, visceral peritoneum (serosa)