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8 Cards in this Set
- Front
- Back
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why does air flow into the lungs |
because of the gas pressure gradients |
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what causes gas pressure gradients |
caused by a pump ( the thoracic cavity muscles) |
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Boyles law states: |
PV=K pressure multiplied by volume equals the constant pressure is caused by gas particles hitting container walls so larger the volume the lower the pressure |
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how air enters the lungs |
lung pressure < atmospheric pressure lung volume increases for inspiration |
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For air to leave the lungs ... |
lung pressure > atmospheric pressure lung volume decreases for expiration |
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muscles used for ventilation |
thoracic cavity (cage) ribs, spine and sternum from top and sides the diaphragm |
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what happens for quiet expiration |
passive muscle relaxation |
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forced expiration |
internal intercostal contracts. |
