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intrapulmonary pressure of 761 and intrapleural pressure of 762 indicates a healthy lung why is this...

intrapulmonary pressure of 761 and intrapleural pressure of 762 indicates a healthy lung

why is this statement false ??
Science   Anatomy-And-Physiology   
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Answer #1

Intrapleural pressure is less than intrapulmonary pressure in a healthy lung. Here in the statement, intrapleural pressure is higher than intrapulmonary pressure. So the statement is false.

Intrapulmonary pressure changes with respiration. When we take an inspiration it becomes negative and during expiration it be becomes positive. But at the end of inspiration or expiration (when the air is not moving in or out from the lungs) it remains equal to the atmospheric pressure because it open to the atmosphere.

On the other hand, intrapleural space is a closed cavity and its pressure is normally negative when compared to intrapulmonary pressure. This is because of the elasticity of lungs which pulls the visceral pleura away from parietal pleura which lines the inner thoracic wall.

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