Importance and 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 exist, and the salivary glands are opened, The function of the mouth...
The mouth is the first organ in the digestive system, and it is a cavity in which the teeth and the tongue exist, and the salivary glands are opened, The function of the mouth...