Digestion

Digestion is the process whereby a biological species processes food to produce usable nutrients. Digestion usually involves mechanical manipulation and chemical action. In most vertebrates, digestion is a multi-stage process in the digestive system, following ingestion[?] of the raw materials, most often other organisms. The process of ingestion usually involves some type of mechanical manipulation.

In humans:

• Digestion begins in the mouth where the food is masticated with the teeth, thereby releasing enzymes from saliva into the food, and starting a reaction with the enzymes in the food itself.
• The food is then further compressed by being sent through the oesophagus to the stomach, a large pouch, where it is churned and thoroughly mixed with acid to chemically decompose it.
• As the acidic level(ph) changes in the stomach and later parts of the digestive tract, specific enzymes are activated or deactivated to extract and process various nutrients.
• Then passed into the small intestine where it is further mixed with secretions such as liver bile, to help digest fats, and pancreas insulin, to process sugars; Most nutrient absorption takes place in the small intestine.
• The final stage in human digestion is the movement of the matter into the large intestine, where water is re-absorbed before defecation.

Not only animals digest food. Some carnivorous plants capture other organisms, usually invertebrate animals, and chemically digest them. Fungi also are very effective at digesting organic material.

Common misspelling and questions (FAQ)

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