PRESENTER:'Here is a demonstration of the cycle of blood around the body ... This short film explains how the heart and circulatory system work, taking a close look at the four chambers, two ...

Find out about the different stages of a human life cycle and how we change ... Find out how the heart keeps all the blood in your circulatory system flowing. What are medicines and drugs?

lungs and circulatory system. Regular cycling may reduce the risk of coronary heart disease, lower blood pressure and improve cardiovascular fitness. Using the right gear cycle for weight loss may ...