Blood enters from superior and inferior vena cava, right atrium, tricuspid valve, right ventricle, pulmonary semilunar valve, pulmonary trunk, pulmonary arteries, lungs, pulmonary veins, left atrium, mitral valve, left ventricle, aortic semilunar valve, aorta, rest of body *Breaks down food into absorbable units that enter the blood for distribution to body cells.
*Composed of the alimentary canal and accessory structures. Mouth, esophagus, stomach, small intestine (duodenum, jejunum, and ileum), large intestine (colon), and anus, Breaks down food into absorbable units that enter the blood for distribution to body cells.
*The system of organs and structures responsible for the digestion of food. The digestive system includes teeth, mouth, esophagus, stomach, small, intestine, large intestine, and colon.