![]() This oxygenated blood travels from the lungs, through pulmonary veins that lead back and join together, to the left atrium, and then through the left ventricle. From there, it flows into the pulmonary artery, which has branches that reach the lungs. The two upper chambers are called atria, and the two lower chambers are called ventricles.īlood flows into the right atrium from the veins of the heart and body (except the lungs), then it flows into the right ventricle. The heart rate increases when the body needs more blood, such as during intense exercise. Electrical impulses within the heart help ensure that it beats with a consistent rhythm and proper rate. The heart also has an electrical system within. It works with the lungs to add oxygen to blood and pump this freshly oxygenated blood through the blood vessels and around the body. The heart is the most important organ of the circulatory system, which helps deliver blood to the body. The corpus callosum connects these two hemispheres. The brain’s two halves are called the right and left hemispheres.
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