Your heart is a muscular organ that helps circulate your blood, which delivers oxygen and nutrients to your tissues. There are four chambers and four valves in your heart, and each ensures proper ...

Check your knowledge of the heart and how blood is transported around the body by blood vessels ahead of your Higher Human Biology exam. Brush up on your knowledge of arteries, capillaries, veins and ...

From artificial heart valves to cellular transplants, new treatments for cardiovascular ailments are being developed every day. To model how they work, researchers need a reliable way to observe the ...