Your heart is a strong muscle, about the size of your fist, and its main job is pumping blood to your entire body. It pumps about 70 times each minute for your entire life – that’s nearly 37 million times a year, and 3 billion times in an 80-year lifespan. Oxygen-rich blood leaves the heart, and travels to all parts of your body. Along the way, your organs and cells pull the oxygen from the blood. The “used-up” blood returns to the heart, picks up more oxygen in the lungs, and the whole thing starts again. To find out more about how this amazing muscle works, visit the website of the Heart and Stroke Foundation.