We all know there's a heart in the body; we've been reading about it since childhood. As long as it beats, humans live. Let's ...

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 ...

As modern lifestyles increasingly challenge the body's natural circadian rhythm, the American Heart Association is ...

After severe heart failure, the ability of the heart to heal by forming new cells is very low. However, after receiving treatment with a supportive heart pump, the capacity of a damaged heart to ...

In diseased hearts, low-dose radiation therapy appears to improve heart function. Cardiologists and radiation oncologists at Washington University School of Medicine in St. Louis pioneered the use of ...

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 ...

When the human body gets hurt, most tissues heal—skin closes over a wound, bone heals itself. But not all organs heal that ...

An organ is a group of tissues that work together to perform a specific task in the body, such as digesting nutrients or producing chemical messengers that enable brain cells to communicate. Although ...