A vampire is headed straight for you. "I vant to drink your blood," he hisses. To prevent him from sucking the life force straight out of you, you decide to distract him with your amazing knowledge of blood. Take the quiz and prove yourself. See more »

Every second of the day, blood bustles through your body, bound for your brain, toes and everything in between. How does your heart receive its fair share of the good stuff? See more »

The natriuretic peptides are sometimes called the body's "natural diuretics" because they lower the concentration of sodium in the blood. See more »

Lub-dub, lub-dub, lub-dub, that's usually the sound of a happy heart. But what's responsible for that steady, comforting beat, and what if your heart doesn't sound like that? See more »

When it comes to the heart, timing is critical. An irregular heartbeat is inefficient and deprives the body of blood. So what sets your ticker's rhythm? See more »

The heart is one of the strongest muscles in the body. Learn about this extremely vital part of the body. See more »

What makes your heart beat is not a simple as you think. Take a look into what makes this crucial organ tick with the help of the information inside this article. See more »