Crimson, scarlet, burgundy, cherry. Blood flows through our bodies in all its vibrant shades of red. Let's explore our circulation system.

Now, surgeons, don't be squeamish as we dissect an animal heart and examine the veins, arteries and chambers up close.

They all work hard to move blood around our bodies. William Harvey was fascinated with anatomy, and made groundbreaking discoveries about valves.

I wonder what we might uncover? Why do people give blood? Find out how to keep your heart happy with cardiovascular exercise and healthy food.

Kickstart a campaign to spread the word about the damage caused to the lungs and heart by smoking.

Hearts pound, flutter and maybe skip a beat. What makes your heart race? Is it a secret? Cross my heart, I won't tell.