term1 Definition1term2 Definition2term3 Definition3
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Inspiration
•external intercostal muscle and diaphragm contract
•rib cage moves upwards and out and diaphragm flattens
•thorax volume decrease pressure falls below atmospheric pressure and air flow in lungs
•requires energy
Expiration
•external intercostal muscle and diaphragm relax
•rib cage moves down and inwards and diaphragm becomes curved
•thorax volume decrease so pressure increases
•doesn’t require energy
Forced expiration
Requires energy
•internal intercostal muscle contracts to pull rib cage down and in
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