Just before inspiration commences, the diaphragm is ____; this occurs in the pause between breaths in normal quiet breathing. Inspiration commences. The ribcage moves ____ and ____ owing to contraction of the ____. The diaphragm ____ and moves ____. This ____ the volume the thoracic cavity, and ____ the pressure. Because of these changes, air moves ____ the lungs, and the lungs ____. Inspiration has taken place. Unlike inspiration, expiration is usually a ____ process because it requires no ____. So, following the end of the inspiration, the diaphragm ____ and moves back into its resting position. The ribcage moves ____ and ____, because the ____ have relaxed. This ____ the volume of the thoracic cavity, and so ____ the pressure within it. Air therefore now moves ____ the lungs and they ____. There is now a rest period before the next cycle begins.
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C05. Respira. Sys (4) - Mechanics
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