Originally appeared on the NOVA Web site Cut to the Heart. Sure, you know how to steal hearts, win hearts, and break hearts. But how much do you really know about your heart and how it works?

Changes in tongue colour can indicate an underlying health issue, such as an infection.” Sometimes, the signs can ...

Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich blood to all parts of the body. amazing heart facts.