The Mechanism of Breathing

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  • Created by: hannahx
  • Created on: 04-01-13 18:28
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    • 1. External intercostal muscles contract, while internal relax
    • 2. The ribs are pulled up and out, increasing the volume of the thorax
    • 3. The diaphragm muscles contract, causing it to flatten, which also increases the volume of the thorax
    • 4. The increased volume of the thorax results in reduction of pressure in the lungs
    • 5. Atmospheric pressure is now greater than pulmonary pressure, and so air is forced into the lungs


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