The heart is an organ that works 24 hours a day, 7 days a week, without stopping. It is responsible for pumping blood throughout the body to supply oxygen and nutrients to the cells, and remove waste products. The heart beats about 100,000 times a day, and even while we sleep, it continues to pump blood to keep our organs and tissues functioning properly. Without the constant work of the heart, the body would not receive the necessary resources to function and survive.