DIGESTIVE SYSTEM

We need food to keep us alive.What happens to that food inside our body? The process from the moment the food enter the mouth until it mixes into blood stream is called digestion.Digestion usually takes up to 18 hours.There are about 8 meters of tubes and chambers inside our body that process the food eaten by us.It consist of organs that help in chewing ,swallowing,breakdown and absorption of food as well as expulsion from the body of what is left afer the process.In the mouth the tongue and teeth helps in breaking of food .Then this bolus is transferred to the stomach after we swallow it.
Gastric juce in the stomach ,is rich in hydrocloric acid and the protein-spilitting enzyme pepsin.Then food reaches Duodenum through a muscular valve.The pancreatic juce contains enzymes for splitting carbohydrate,protein and fat in the food.Bile a bitter liquid in the liver also help in this process.This useful digested food passes through Small intestines and is taken by the blood to the liver.Liver receives 1.5litres of blood a minute.Here occur storage and recombination of the digested food.The waste products are pushed out of the body through the large intestine and the rectum.Food spend six hours in the stomach.Food is held in the stomach by a ring called pyloric sphincter.Liver is the chemical factory of the body,scientist have counted over 500 liver functions.

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