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  2. Here is a diagram of the human heart12:
    • The heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers).
    • Oxygen-poor blood flows into the right atrium, then to the right ventricle, and is pumped to the lungs.
    • Oxygen-rich blood returns from the lungs to the left atrium, then to the left ventricle, and is pumped out to the rest of the body.
    • Heart valves ensure proper blood flow.
    Learn more:
    This article provides a comprehensive look at the heart's structure with a detailed, labeled diagram and realistic photos, guiding you through each part and its role in the circulatory system.
    www.verywellhealth.com/heart-anatomy-8654202
    This image shows the four chambers of the heart and the direction that blood flows through the heart. Oxygen-poor blood, shown in blue-purple, flows into the heart and is pumped out to the lungs. Then oxygen-rich blood, shown in red, is pumped out to the rest of the body, with the help of the heart valves.
    www.nhlbi.nih.gov/health/heart/anatomy
     
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