How is air brought into the respiratory system to reach the respiratory surfaces?

by Ron Sombilon Gallery

How is air brought into the respiratory system to reach the respiratory surfaces?How is air brought into the respiratory system to reach the respiratory surfaces? - Please Help!
Thank you

Posted by Graham308
When you breathe in, your intercostal muscles (these are muscles in between your ribs) contract. This makes your ribs move up and out. At the same time your diaphragm flattens. These steps increase the chest volume, and this draws air into the lungs because the pressure outside the lungs is greater than inside, and the air rushes in to restore the balance of pressure.

The air travels down your trachea (windpipe), down your bronchi, then down into your alveoli (which are the air sacs we use to exchange gases in our lungs)

Hope that helps =]

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