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8 Cards in this Set

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why does air flow into the lungs

because of the gas pressure gradients

what causes gas pressure gradients

caused by a pump ( the thoracic cavity muscles)

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

how air enters the lungs

lung pressure < atmospheric pressure




lung volume increases for inspiration

For air to leave the lungs ...

lung pressure > atmospheric pressure




lung volume decreases for expiration

muscles used for ventilation

thoracic cavity (cage)


ribs, spine and sternum from top and sides


the diaphragm

what happens for quiet expiration

passive muscle relaxation

forced expiration

internal intercostal contracts.