Digestion

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.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Chemically: REDIRECT Chemistry...

Multicellular: REDIRECT multicellular organism...

Cellular: For cellular phones see Mobile phoneFor cellular radio networking in general see cellular networkFor cellular in the meaning of biology, see Cell (biology).For the 2004 movie see Cellular (film)....