As you breathe in...
- The muscles contract
- The ribs move up and outward
As you breathe out...
- The muscles relax
- Ribs move in and down
Diaphragm
As you breathe in...
- The diaphragm contracts, moving down
- Low pressure is created inside the lungs, forcing air in
- Diaphragm pulls down
As you breathe out...
- The diaphragm relaxes
- Pushes upwards
- High pressure is created inside the lungs, forcing air out
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| Source: BBC BitesizeFigure 1: A diagram of the respiratory system |
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