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.
The largest and most famous of the true pyramids is the Great Pyramid at Giza. Built for the great Pharaoh Khufu, the Great Pyramid âstands today at four hundred and fifty feet highâ (Padwe). Originally the Great Pyramid had stood at over four hundred and eighty one feet tall, however, due to weathering and the sands of time some of its height was lost.