The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

The human body is a wonderous thing, especially when you consider how intricate and efficient each bodily system is. For instance, an adult’s blood vessels could encircle the earth 2.5 times if ...

A new type of surgically implanted pump that can support a child's failing heart has passed the first stage of human testing in a recent trial. A small, implantable cardiac pump that could help ...

Science writer Mary Roach is fascinated by the human body, especially, she says, the "gooey bits and pieces of us that are performing miracles on a daily basis." Take the human heart, for instance. If ...

In a new test of xenotransplantation, a medical team at the University of Maryland Medical Center announced Friday that, for only the second time in history, it had transplanted a heart from a ...

David Bennett Sr. received a new heart from a genetically modified pig. A 57-year-old man who underwent a first-of-its-kind heart transplant involving a genetically-modified pig heart is in a "much ...

New York researchers transplanted pig hearts into two brain-dead people over the last month, the latest in a string of developments in the long quest to one day save human lives with animal organs.