Down with the Good Lung

Abstract
One of the more remarkable features of the lungs is the way in which alveolar ventilation is automatically adjusted to pulmonary-capillary blood flow as body position changes. Through this self-adjusting mechanism, the gaseous composition of arterial blood remains virtually constant. This is no mean feat, since the architecture of the lungs is not uniform: the left lung is smaller than the right, and the heart intrudes more into the left hemithorax than into the right. Moreover, no matter how the body turns, the force of gravity continues to pull on the lungs and the other contents of the thorax.In . . .

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