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 ...

Your life depends on the regular beat of your heart. Dr Karl explains how this mighty four-stage pump works. The heart is the organ of love — but it's also a mighty pump. In an average 75-year ...

Have you ever paused to wonder how many times your heart has beaten since birth? This incredible organ works tirelessly, never resting, yet most of us rarely consider its relentless rhythm, ...