When digestion of food takes place within the cell it is called intracellular digestion e.g., amoeba.
When digestion of food takes place outside the cell body or in the alimentary canal, it is known as extracellular digestion e.g., man, frog etc.
Salivary glands secrete their secretion called saliva in the mouth cavity, There are three pairs of salivary glands located in the mouth.
Functions of saliva:
(i) Saliva moisten the food thus help in chewing of food by the teeth.
(ii) Human saliva contains an enzyme called salivary amylase that converts starch into simple sugar.
(iii) Saliva also helps in swallowing and easy passage of chewed food through the food canal.
Villi are the fingers-like structures present on the inner surface of the small intestines. About five millions of villi are present in the intestines, they increase the absorptive surface of the intestine considerably and facilitate quick absorption of the digested food.
Position of liver, gall bladder, bile duct, upper part of small intestine and pancreas
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