Map of the Human Heart Let's get straight to the heart of the matter—the heart's job is to move blood. Day and night, the muscles of your heart contract and relax to pump blood throughout your body.

Specifically, the researchers found that neurons below the skull send signals from the heart to the brain that trigger a drop in heart rate, blood pressure and breathing rate. That, in turn, may ...

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 ...