Digestion is the process whereby a biological entity processes a substance, in order to chemically convert the substance into nutrients.

Digestion occurs at the multicellular, cellular, and sub-cellular levels.

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.

For more information about the topic Digestion, read the full article at Wikipedia.org, or see the following related articles:

Saliva — Saliva is the watery and usually somewhat frothy substance produced in the mouths of some animals, including humans. Produced in salivary glands, ...  > read more

Gastrointestinal tract — The gastrointestinal tract or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within ...  > read more

Stomach — In anatomy, the stomach is an organ in the gastrointestinal tract used to digest food. In general, the stomach's primary function is not the ...  > read more

Esophagus — The esophagus (also spelled oesophagus/œsophagus), or gullet is an organ in vertebrates which consists of a muscular tube through which food ...  > read more

Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.

Recommend this page on Facebook, Twitter,
and Google +1:

Other bookmarking and sharing tools:

Related Stories

Search ScienceDaily

Recycling Revolution