A diagram of the heart. Colors show the different types of proteins that connect cells, allow electricity to flow, and cause the heart to beat. Journalists may use this image only with appropriate ...

The right coronary artery supplies blood to a part of the heart. To do this effectively, it branches off into smaller arteries, such as the conus artery and the sinoatrial nodal branch. Each branch ...

The four valves of the heart allow blood to flow through the heart in the right direction. The valves open or close each time the heart beats. Problems with the heart valves can lead to palpitations, ...