These pictures show the heart from the front. The right side of the heart is on the left side of the heart pictures. The left side of the heart is on the right side of the pictures.
Your heart has four separate chambers that pump blood. The chambers are called the right atrium, right ventricle, left atrium, and left ventricle. The right and left sides of the heart are separated by a muscular wall that prevents blood without oxygen from mixing with blood that has oxygen. The heart also has valves that separate the chambers and connect to major blood vessels.
Your heart is divided into two separate pumping systems, the right side and the left side.
The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where the blood picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.
Blood travels through your heart and lungs in four steps:
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