Human Digestion: Step-by-Step Process from Ingestion to Egestion

Main Stages of Human Digestion

1. Ingestion – taking food into the mouth.
2. Mastication – chewing breaks food into smaller pieces and mixes it with saliva.
3. Deglutition – swallowing moves food from mouth to stomach.
4. Gastric Digestion – stomach acid and enzymes further break down food.
5. Absorption – nutrients pass into the bloodstream primarily in the small intestine.
6. Egestion – undigested waste is eliminated as feces via the large intestine.

Each stage involves specific organs and secretions working together to extract nutrients and energy.