Travel Reference
In-Depth Information
Figure 9-1. Anatomy of the respiratory system
Effect of Body Position
In the standing position the diaphragm lies low in the chest, permitting full expansion
of the lungs. When a person lies down, however, the abdominal organs push against the
diaphragm,whichisdisplacedtowardthehead,compressingthelungsandreducingventil-
ation. When obese individuals are in a supine position, the abdominal organs may push the
diaphragmuptothelevelofthenipples,seriouslyimpedinggasexchangeinthelungs.Pla-
cing a person on his side permits the abdominal organs to shift away from the diaphragm
and can improve ventilation, particularly in the upper portions of the lungs. In a sitting po-
sition the abdominal organs tend to fall away from the diaphragm, improving respiration.
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