BIOLOGY: : DIGESTION IN HUMAN BEINGS:

DIGESTION IN HUMAN BEINGS: Digestion in human beings starts in the mouth and ends in the Anus.At first food is taken in the mouth cavity with the help of a bite. That bite is given by our teeth and after that food is chewed . When the grinding of the food takes place salivary amylase secreted by the salivary gland is acted over the food and turn the food into paste. This process of converting the solid food into a paste is called Mastication. Out the most vital six components of our food, Carbohydrates digestion starts in the mouth.

From the mouth cavity the food then reaches the oesophagus. This partial digested food which enters the oesophagus is known as Bolus. Oesophagus then undergo contraction and expansion which helps the food to reach the stomach.

In the stomach digestion of Protein takes place but the final protein digestion occurs in the small intestine. Stomach has in it gastric juice, H.Cl and mucous. There is also the occurrence of a type of bacteria in our stomach called E.coli. H.Cl provides acidic medium in the stomach for the digestion of protein. Gastric juice mainly contains proteolytic enzymes.

Partial digested food from the stomach that reaches the intestine is called as chyme.

Liver is the largest gland of our body. It has in it gall bladder. Gall bladder stores bile produced in the liver. At the time of digestion bile passes to the small intestine, Bile does not contain any enzyme.Bile helps in the emulsification of fats

In the small intestine final digestion of all the food materials take place. Pancreas which is positioned just above the small intestine produces pancreatic juice. At the time of digestion pancreatic juice reaches the small intestine. So all together small intestine contains - intestinal juice, which is produced by it, Pancreatic juice from Pancreas and the bile from the liver.

Finally the complex food ie. Protein, carbohydrates and Fats get digested in the small intestine. Undigested food are thrown out from the body.