A man connected to a body plethysmograph for estimation of FRC inspires against a closed glottis. Which of the following statements is true
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
The pressure in both the lungs and the box increases
The pressure in both the lungs and the box decreases
The pressure in the lungs decreases, but that in the box increases
The pressure in the lungs increases, but that in the box decreases