The first thing you notice about Glenna Gordon’s book Diagram of the Heart is that it’s small. Small enough to fit in a coat pocket. It has a soft cover too. It is a design that purposefully mimics ...

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 ...

As the central part of the circulatory system, the heart is responsible for pumping blood, supplying oxygen and nutrients, and removing metabolic waste such as carbon dioxide from all the tissues in ...

The human heart is a finely-tuned instrument that serves the whole body. It is a muscular organ around the size of a closed fist, and it sits in the chest, slightly to the left of center. The heart ...