During normal, quiet inhalation
A. air is drawn into the lungs because of the contraction of the internal intercostal muscles.
B. there is an increase in the atmospheric air pressure.
C. the diaphragm relaxes while the rib cage is pulled down.
D. the volume of the thoracic & pleural cavities increases.
E. air is introduced into the pleural cavity thus increasing the pressure around the lungs.
Answer: D. the volume of the thoracic & pleural cavities increases.
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