The Digestive system

Digestive system is the collective name used to describe the alimentary canal, some accessory organs (e.g. liver, pancreas) and a variety of digestive processes that take place at different levels in the tract to prepare the food that we eat, for absorption.

The alimentary canal (tract) consists of
*Mouth * Pharynx * Esophagus * Stomach * Small intestine * Large intestine * Rectum & anal canal

About the Accessory Organs: - The accessory organs of digestion are the glands situated outside the tract and their secretions enter the tract through the ducts. These are: 1) Three pairs of salivary glands 2) Pancreas 3) Liver and the biliary tract

The major activities of digestive system are: -
a) Ingestion: Process of taking food into the alimentary tract
b) Propulsion: Movement of contents along the tract
c) Digestion: This consists of First Mechanical breakdown of food and Chemical digestion of food by the enzymes present in the secretions.
d) Absorption: Process of passage of digested food through the walls of the tract into the blood & lymph capillaries for circulation round the body.
e) Elimination: Process of excretion of undigested & unabsorbed food as faeces.
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