The circulatory system consists of one heart ... Blood flows through arteries and veins, with valves ensuring unidirectional movement, while capillaries allow nutrient and waste exchange at ...

Cold toes, color changes, and swelling could be early signs of poor circulation. Here's how your toes signal cardiovascular ...

This short film explains how the heart and circulatory system work, taking a close look at the four chambers, two sides, and the valves of the heart. BBC Teach has thousands of free, curriculum ...

Veins hold about 65 per cent of the body's blood and have one-way valves tohelp blood move. Capillaries, which carry blood to our tissues, are one-tenth the thickness of a human hair. In each ...