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 ...

Get pumped up — it's time to show off your knowledge about the heart. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Your heart pumps blood from ...

The models can be used to plan surgeries and in the future could be used to help trial new drugs. A healthy heart beats at a steady rate, between 60 and 100 times a minute. That’s not the case for all ...