Question:
- the pressure of air in the lungs is less than outside - low pressure inside is achieved by increasing the volume of lungs - the diaphragm and intercostal muscles contract - the diaphragm moves down - the rib cage moves out and up - air flows in until pressure is equal - rib cage becomes important in heavier breathing
Author: Abbey ManAnswer:
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Abbey Man![Abbey Man](https://lh4.googleusercontent.com/-KqJzJa-lwKk/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucl0mFj_bOqMZvwiwPDbd8jjrQnoug/photo.jpg)