Page 8 - TheBodyBook

1. Windpipe 2. Lungs
3. Diaphragm
You need to keep breathing all the time, even when you’re asleep.
Breathing air
1
2
3
Your windpipe branches into smaller tubes
Every time you breathe in, you fill your lungs with air. Air has a gas called oxygen in it which you need to stay alive.
Every time you breathe out, you get rid of a waste gas called carbon dioxide.
The air travels through your mouth and nose and down a tube called your windpipe into your lungs.
Inside your lungs are tiny air sacs. Oxygen moves out of them and into your blood to be carried around your body.
You have 600 million air sacs in your lungs
Under your lungs is a sheet of muscle called a diaphragm.
It moves up and down to help move air in and out of your lungs. You can get hiccups if your diaphragm moves too quickly.
Coughing and sneezing happen when your
body tries to get rid of dust or dirt that has got inside your windpipe or your nose.
Aaachoo!