PHGY 214 Chapter Notes - Chapter 11.3: Internal Intercostal Muscles, Thoracic Cavity, Lung Volumes

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16 Jun 2018

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Exhalation

Exhalation may be passive or active

Passive exhalation: relaxation of muscles of

inspiration & elastic recoil of the lungs allows

the chest cavity to decrease in volume. This

reverses the pressure differential in inhalation

Active exhalation: the internal intercostal

muscles & abdominal muscles - forcibly

decreases the volume of the thoracic cavity;

pushing air out

Spirometer: used to measure lung capacities

and volumes

Total lung capacity: maximum volume of air

in the lungs when one inhales completely

• Usually around 6-7 liters

Residual volume (RV): minimum volume of

air in the lungs when one exhales completely

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