Inspiration Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction. During inspiration, the diaphragm ____ and the thoracic cavity ____ in volume. This ____ the intra-alveolar pressure so that air flows into the lungs. Inspiration draws air into the lungs. Expiration Expiration (exhalation) is the process of letting air out of the lungs during the breathing cycle. During expiration, the ____ of the diaphragm and elastic recoil of tissue ____ the thoracic volume and ____ the intra-alveolar pressure. Expiration pushes air out of the lungs.

Ventilation

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