The Digestive System

Purpose

to break down food into nutrients that can be absorbed by the circulatory system, which take them to the parts of the body where they are needed.

Four Stages Of Digestion

Ingestion, Digestion, Absorption, Egestion

Ingestion

Take Food In

Digestion

Breakdown of food into molecules

Absorption

taking digested molecules into cells of the digestive tract

Egestion

removal of waste from the body

Mechanical digestion

This involves the breakdown of food particles into smaller pieces using the teeth, tongue, and stomach. Is a physical change.

Chemical digestion

Involves the use of enzymes. is a chemical change.

Human Digestion

Digest food along a difestive tract called the alimentary canal, which is a one way flow complete with a mouth and anus, and food encounters specialized areas along the way for digestion.