Your heart is a pump that is responsible for delivering blood to all parts of your body. Arteries carry oxygen-rich blood from the lungs to nourish the cells, and veins transport oxygen-poor blood on its way back to the heart and lungs. This animation shows how the heart and circulatory system work.
Your heart is responsible for pumping a constant supply of oxygen-rich blood to your organs and tissues. A heart attack occurs when the blood flow to your heart muscle is disrupted or stopped, usually because of heart disease.
