The illustrations above show the circulatory system including various parts such as arteries and veins. (World of Anatomy and Physiology, 2010) & (Gale Science in Context, 2010)
Picture of red blood cells located in a sectioned vein. Red blood cells, or erythrocytes, are vital to the circulatory system by functioning to carry oxygen in the body - back and forth. (Gale Science in Context, 2010)
This picture also illustrates red blood cells circulating through a vein but also depicts white blood cells, or leukocytes. Cells that are essential to the bodies immune system. (Biology, 2010)
This illustration shows the parts of a heart: aorta, pulmonary valve, pulmonary veins, left atrium, mitral valve, left ventricle, septum, right ventricle, inferior vena cava, tricuspid valvem pulmonary veins, right atrium, superior vena vaca, and pulmonary aterty. (Gale Science in Context, 2010)