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Diaphragm Relaxes And Thorax Research Paper

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Inspiration is when the diaphragm contracts and the thorax expands allowing air to enter the lung. When this happens the alveolar volume increases and causes a decrease in alveolar pressure below barometric air pressure and air flows into the lungs. Alveolar pressure is the pressure in centimeters of water pressure (cm H2O) retained in the alveoli of the lungs during inspiration. Barometric pressure, is the pressure applied to by the weight of air in the atmosphere of Earth. At the end on inspiration the diaphragm stops contracting and the alveolar pressure becomes equal to barometric air pressure and no more movement of air occurs. During expiration, the diaphragm relaxes and the thorax decreases resulting in a decrease in alveolar volume

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