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3 Cards in this Set
- Front
- Back
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Inspiration |
1) The external intercostal and diaphragm muscles contract. 2) Causes the rib cage to move upwards and outwards and the diaphragm to flatten- increasing the volume of the thorax 3) Lung pressure decreases to below atmospheric pressure 4) This causes air to flow into the lungs 5) This is an active process, it requires energy |
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Expiration |
1) The external intercostal and diaphragm muscles contract 2) The ribcage moves downwards and inwards and the diaphragm becomes curved again 3) Thorax volume decreases causing the air pressure to increase above atmospheric pressure 4) Air is forced out of the lungs 5) Normal expiration is a passive process- it doesn't require energy |
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Forced expiration |
The diaphragm pushes upwards
Internal intercostal muscles contract, to pull the rib cage down and in |
