KINE 2011 Lecture Notes - Transpulmonary Pressure, Intrapleural Pressure, Alveolar Pressure
29 Mar 2014
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Document Summary
It was 6mmhg at the end of breathing in and that" why lung was bigger and recoil pressure went to 6mmhg. Intrapleural pressure increases to 756mm that drops transpl to 4mmhg recoil pressure is still 6mmhg. The pressure pushing out on the lung is less than elastic recoil therefore the lung collapses. Alveoli get smaller, pressure in the alveoli it increases. Pressure goes from 760 to 761mmhg in alveoli . Pressure in alveoli (761) is greater than atmospheric(760) therefore there is a pressure gradient. When you have a pressure gradient it is greater in the alveolus than it is outside the alveolus , air gets pushed out. Expiration is a passive process since it takes energy to breathe in but relax to breathe out. During strenuous exercise when you force the air out then you might be using energy but its relaxing process.
