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.
In addition to Khufuâs pyramid, two other large pyramids for pharaohs were erected at the Giza site, one for his son Khafra (it originally stood 471 feet high) and the other for Khafraâs son Menkaure (originally 218 feet high). Khafraâs pyramid complex is home to the famous Great Sphinx statue, which measures 241 feet long and about 66 feet high. Over the ages, all three pyramids have been targeted by grave robbers and much of their exterior white limestone stolen, possibly for use in other building projects.