The mouth leads to a short esophagus which, in turn, lead to the stomach. The stomach and anterior portion of the intestine are surrounded by a large digestive gland. The stomach grinds and stores the food. Digestion takes place in the intestine. Food is distributed to the cells of the body by blood.
Blood is pumped by the heart into blood vessels called arteries.
From the arteries, blood enters sinuses. Blood enters the heart through pores in the side of the heart. It is then ready to be pumped from the heart. This type of circulatory system is called an open circulatory system. Digestive waste leaves through the anus.