The structure of the digestive system in reptiles.

Reptiles are predominantly predators, but there are also plant species, such as iguanas and turtles). The oral cavity is separated from the pharynx, there is a tongue and jaw with tapered teeth. Their teeth serve to hold, break and capture prey. The tongue may protrude far out of the mouth. In lizards and snakes, the tongue is bifurcated, serves as an organ of touch and taste, and in a chameleon it serves to obtain food. The secret of the salivary glands contains enzymes (protein molecules that accelerate chemical reactions), and in some lizards, the tongue is poisonous.