The function of the mouth in the human digestive system

The mouth

The mouth is the first organ in the digestive system , And it is a cavity in which the teeth and the tongue are existed , and the salivary glands are opened , The function of the mouth is cutting and grinding the food by the teeth , And It digests the starch into the sugar .

The teeth

The number of the teeth is 32 in the adults  ,  They are existed in two jaws which are the upper jaw and the lower jaw , and each jaw has 16 teeth divided into ten molars ( 4 premolars and 6 molars ) , four incisors and two canines .

The function of the four incisors and two canines is cutting and tearing the food into small pieces  , And the ten molars grind the food to make its swallowing easy .

The mouth

The mouth in the human body .

The milk teeth are weak formed through the childhood phase and their number is 20 teeth , where each jaw have ten teeth .

The milk teeth are completely replaced by strong ones before the age of twelve , And they are divided into 4 incisors , 2 canines and 4 molars .

The tongue

The tongue is an organ that has several functions . It is the speech organ as it changes the sound coming from the larynx into understandable words .

The tongue mixes the food with the saliva to help in the food swallowing , The tongue moves the food around inside the mouth cavity , and it is responsible for tasting the food .

The salivary glands

There are three pairs of the salivary glands , They secrete saliva liquid that contains digestive substances ( the enzymes ) that digest the starch into the simple substances called the sugar .

The enzymes are the digestive substances that digest the food and covert it into the simple substances .

Digestion in man , Buccal digestion and Gastric digestion ( digestion in stomach )

Small intestine , Absorption of digested food , Metabolism , Large intestine and defecation

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