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The Digestive System

The digestive system is a tube through which food passes from the mouth where food is ingested to the anus where it is egested. It consists of a series of organs, each with a distinct structure and function. During the digestive transit food is broken down into substances suitable for absorption into the bloodstream.
The gut wall has the same basic structure along its length. There are three main layers:

These three layers have different adaptations in different parts of the alimentary canal. The adaptations are underlined below.

Oesophagus

Stomach

Small Intestine

Large Intestine

Rectum

Digestion

Proteins

What are enzymes?

Enzyme Activity

Carbohydrates

Starch

Biochemical Tests