How does the heart work? What does it do? What is it composed of? How do you examine it? This article offers cardiac anatomy and physiology in a nutshell. The heart is a complex organ that pumps blood ...

People have long been fascinated with hearts—how they work, how they change and how they break. The Grinch’s heart grew three sizes. Sgt. Pepper had a band for lonely hearts. And the Doctor on the ...