Select all of the following that are true regarding the combined lung/chest wall

Question

Select all of the following that are true regarding the combined lung/chest wall relaxation pressure curves.

at FRC, the pressure in the pleural space is negative

at FRC, the pressure in the lungs is positive

at FRC, the force of the chest wall and lung are at equilibrium

at 70% of the vital capacity, the pressure in the lungs is positive

at RV, the pressure in the lungs is negative

      -       A.       B.   

at FRC, the pressure in the pleural space is negative

      -       A.       B.   

at FRC, the pressure in the lungs is positive

      -       A.       B.   

at FRC, the force of the chest wall and lung are at equilibrium

      -       A.       B.   

at 70% of the vital capacity, the pressure in the lungs is positive

      -       A.       B.   

at RV, the pressure in the lungs is negative

Explanation / Answer

at FRC, the pressure in the pleural space is negative(TRUE)-At FRC negative pressure is generated by opposing the elastic forces of chest wall and lung.

at FRC, the force of the chest wall and lung are at equilibrium(TRUE)-FRC represents the volume at which both the chest wall and lung are at equilibrium.

at RV, the pressure in the lungs is negative-(TRUE)-Yes the interpleural pressure is negative

All the above given statements are true.

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