The heart draws oxygenated blood from the lungs and distributes it to the rest of the body using a system of arteries and veins. Small coronary arteries and the pulmonary veins provide oxygenated blood into the heart. The pulmonary artery then pumps deoxygenated blood to the lungs where it is resupplied with oxygen.
The heart is made up of two parts separated by the septum. Four chambers and four valves help control the way the blood flows into and out of the heart. Each chamber consists of a top part, or atrium, and a bottom part, or ventricle. The right atrium and the right ventricle pump blood into the lungs via the pulmonary artery. The blood picks up oxygen in the lungs and returns to the heart through the left atrium and left ventricle. The left atrium pumps blood through other parts of the heart and the rest of the body. The oxygenated blood circulates through the body. Deoxygenated blood from the body goes back to the right atrium where the process begins again.
The aorta and the coronary arteries play an important role in providing oxygenated blood to the rest of the heart. The coronary arteries help move oxygenated blood from the aorta to the heart. The aorta provides oxygenated blood from the left atrium and left ventricle to the rest of the body.