Your heart is a muscular organ that helps circulate your blood, which delivers oxygen and nutrients to your tissues. There are four chambers and four valves in your heart, and each ensures proper ...

Our heart and lungs circulate oxygen throughout our blood vessels to keep cells alive. At the center of the circulatory system is the heart, which works with the lungs to constantly keep the body ...

Contrary to the widely accepted explanation that the human heart is simply a pump, Mayo Clinic researchers have uncovered novel findings on how cardiac muscle operates. The findings will appear in the ...