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. When blood returns ...

The physical forces exerted by a heart beat and the blood flow it produces trigger the formation of new blood cells, according to two studies published today (May 13) in Nature and Cell. Zebrafish ...

During exercise, your heart pumps faster, vessels dilate to accommodate increased blood flow, and the rhythmic contraction of muscles helps propel blood through your veins back to your heart.

The valves prevent the blood flowing backwards. The heart is relaxed and blood flows into both sides from the veins. The right and left atrium contract. Blood is forced into the right and left ...

Your surgeon will make an incision in your chest to access your heart and will use a machine to take over blood flow while your heart is temporarily stopped. In some cases, minimally invasive ...

In addition to causing several types of cancer, human papillomavirus (HPV) appears to bring a significantly increased risk of ...

Originally appeared on the NOVA Web site Cut to the 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 ...