The abdominopelvic cavity is a closed system filled with a fluid (water) continuum.
The abdominopelvic cavity is enclosed by essentially muscular barriers. The inferior end is closed off by the pelvic diaphragm.
The cylindrical walls of the abdomen are composed of three muscular sheets.
The thoracic diaphragm is attached to the inferior margin of the rib cage and to the bodies of the lumbar vertebrae behind.
Diaphragmatic Inhalation involves the thoracic diaphragm contracting and lowering. Thus, the vertical diameter of the thoracic cavity is increased.
Diaphragmatic Exhalation occurs when the thoracic diaphragm relaxes. This decreases the vertical diameter and the volume of the thoracic cavity. Since the air pressure in the lungs is relatively greater than the outside atmospheric pressure, air is forced out through the respiratory passageways.
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