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What is A man connected to a body plethysmograph for estimation of FRC inspires against a closed glottis. Which of the following statements is true and explain in detail?
During Plethysmography, the following are the changes.
-        Lungs
o   During Expiration- Volume decreases, pressure increases
o   During inspiration- Volume increases, pressure decreases
-        Chamber
o   During expiration- Volume increases, pressure decreases
o   During inspiration- Volume decreases, pressure increases