1. Lungs and breathing

2. Why do we have lungs?
When we breathe in, air goes into our lungs. We need air to stay alive. We breathe all the time.

3. Lung facts
When you are asleep, you breathe slowly. When you run about, you breathe faster because your body needs more air. Exercise helps your lungs to stay healthy.

4. Find out how much breath you have in your lungs
Fill a bottle with water
Stand it upside down in a bowl of water
Put one end of a bendy drinking straw into the bottle
Now take one deep breath and
blow gently through the straw
All the air from your lungs will
now be trapped in the bottle