When does the digestion happen?

digestion begins in the mouth

The processes of digestion include five activities: Ingestion, Digestion, absorption, assimilation and egestion.

Ingestion- Ingestion is the consumption of a substance by an organism. In animals, it normally is accomplished by taking in a substance through the mouth into the gastrointestinal tract, such as through eating or drinking. In single-celled organisms ingestion takes place by absorbing a substance through the cell membrane.

Digestion- Digestion is the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive. The digestion process also involves creating waste to be eliminated.

Absorption- The simple molecules that result from chemical digestion pass through cell membranes of the lining in the small intestine into the blood or lymph capillaries. This process is called absorption.

Assimilation- Assimilation is the movement of digested food molecules into the cells of the body where they are used. For example: amino acids are used to build new proteins.

Egestion- Egestion is the act of excreting unusable or undigested material from a cell, as in the case of single-celled organisms, or from the digestive tract of multicellular animals.

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