Orginal Publication Date
MCV/Q, Medical College of Virginia Quarterly
The mass movement of gases into and out of the lungs is accomplished by muscular work. This requires energy expenditure, caloric consumption, oxygen utilization, and carbon dioxide production. Inspiration is always an active process, enlarging the volume of the thorax, thereby increasing the negative pressure so that air flows into the lungs. Expiration is ordinarily passive but may require muscular work.
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