Like humans, the Zebra has a four chamber heart: consisting of the right and rleft atria, and left and right ventricles. The heart carries in blood, using red blood cells for help, through the heart and through the lungs to re-oxygenize it. The heart of a zebra matures through the age of four. Because zebras are so wild, and live in areas where they are usually surrounded by more than one predator, their bodies are able to react and slightly change to ensure survival. For example, when a zebra runs, its red blood cell count is doubled, which enables the zebra to take in and circulate more oxygen. The zebra is able to change the productivity of its circulatory system to ensure maximum strength and survival. The zebra's heart, as seen in the photo on the upper left, is located directly above the shoulder blade in the middle of the body. As stated in the elephant section, almost all animals have similar functions within their circulatory systems. The function of a zebra's circulatory system is virtually the same as a hippo's. For example, humans and zebras don't only have similar functions within their systems, but their hearts are remarkably similar, and the set up and placement of the parts of the heart are very close to identical.