The main objective of the circulatory system is  transporting oxygenated (rich saturation of oxygen) blood around  the body. The de-oxygenated blood enters through the vena cava and  into the right atrium of the heart. It then goes to the right  ventricle, directly below the atrium.
Pyramid of the Sun. Less than half a mile south of the Pyramid of the Moon is the Pyramid of Sun. At a height of more than 200 feet (63 meters) and a base more than 730 feet (225 meters) long on each side, this pyramid is one of the largest structures created in the pre-Columbian New World. It would have been completed around 200 AD.
It covered an area of 13 acres. The original height of the Great Pyramid was 485 feet, but due to erosion its height declined to 450 feet. Each side of the square base is 755.5 feet in length. The angle of the pyramid is 51 degrees, 51 minutes, and 14.3 seconds.