Use this resource to find out how the lungs work, how oxygen enters your body and how carbon dioxide is removed. Find out about asthma, how it affects the lungs and how medicines can be used to treat an asthma attack.
With this resource you will be able to find out about the heart and circulation in humans. Explanations will help you to understand how the heart pumps blood around the body and how it carries oxygen. View the animations and test yourself using the quiz questions.