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The heart has four chambers - two atria and two ventricles, divided by a septum and valves called AV valves. The right side sends deoxygenated blood to the lungs, while the left side sends oxygenated blood to the body. Blue blood is deoxygenated, returning from the body to the lungs for oxygen. The heart is divided into four chambers, two atria, a left atria and a right atria, and two ventricles. And these chambers are divided by a septum that comes down the middle and then valves, the AV valves or the atrioventricular valves we call them. The right side of the heart is responsible for sending blood to the lungs to get oxygen and the left side of the heart is responsible for sending blood out to the body to provide oxygen and nutrients to the body as well as to the muscle of the heart. So blue is deoxygenated blood because this is blood that comes back from the body to go to the lungs again to get oxygen. So the right side of the heart pumps deoxygenated blood to the lungs. The left side of the body, I'm sorry, the left side of the heart pumps oxygenated blood to the body.