There are 3 types of teeth. The molars are for chewing and grinding, canines are for ripping and tearing, incisors are for slicing and cutting. As the food is chewed it is mixed with a digestive juice called saliva. The tongue helps to mix the food and saliva together.
With the Muscular System, when the food is swallowed it goes into the esophagus. The esophagus has two sets of muscle fibers, the longitudinal muscles (which go down the esophagus) and the circular muscles (which go round the esophagus).
Inside the stomach the food is mixed with gastric juice and HCL acid to break down the food. Gastric juice contain pepsin which starts the breakdown of protein.
With the Circulatory System, the intestine absorb nutrients and deliver the digested nutrients to the cells.
Undigested food is made into feces and stored before passing out through the anus.