Inside our chest, our lungs take in oxygen from the air we breathe. The oxygen is carried by the blood to the rest of the body. Air is about one-fifth oxygen and oxygen releases the energy the body needs to stay alive. Healthy lungs can be damaged by smoking cigarettes. Tobacco smoke contains poisonous chemicals such as nicotine, carbon monoxide and tar. A cigarette smoking machine shows the tar built up after a few cigarettes.

This clip is from:
Science Clips, Keeping Healthy
First broadcast:
28 April 2009

This clip can be used when learning about the human body and investigating healthy living. Show the clip to illustrate how the lungs work. Invite the children to draw a sketch of the human body with the lungs visible and lines indicating the journey of oxygen through the airways and arteries. The clip could be used to spark a discussion about smoking. Invite the children to note down all the Present the children with symptoms of various diseases and conditions and ask them to identify the ones caused by smoking.