The Diaphragm

37.5 The physiological advantage of a substantial increase in chest circumference during forced inspiration is that more air enters the lungs and therefore enables a higher rate of oxygenation of the blood.

37.6 An opening in the chest cavity, known as a pneumothorax, causes the pressure in the pleural space to rise above that in the lungs (it is normally lower), and the lung collapses partially or completely (Berkow, Beers and Fletcher, 1997, 208).

37.7 A small pneumothorax usually requires no treatment, and the air is usually absorbed within a few days and causes no breathing problems (Berkow, Beers and Fletcher, 1997, 209). In a larger pneumothorax, the air may take from two to four weeks to be absorbed, but it can be removed more quickly by the placement of a chest tube into the pneumothora

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Approximate Word count = 900
Approximate Pages = 4 (250 words per page)

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