The function of the mouth in the human digestive system
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 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 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 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 .