Figure 23-2 Mechanics of Ventilation
Use Figure 23-2 to answer the following question:
-What pressure will be present in the space labeled "4"?
A)alveolar pressure
B)interpleural pressure
C)subalveolar pressure
D)subatmospheric pressure
E)atmospheric pressure

Question

Figure 23-2 Mechanics of Ventilation
Use Figure 23-2 to answer the following question:
-What pressure will be present in the space labeled "4"?
A)alveolar pressure 
B)interpleural pressure 
C)subalveolar pressure 
D)subatmospheric pressure 
E)atmospheric pressure

Quizplus · Accepted Answer

Space labeled "4" is the alveolar space and is connected to the outside air through the airways. Therefore, the pressure in this space will be subatmospheric (lower than atmospheric pressure) during inspiration and slightly higher than atmospheric pressure during expiration, allowing air to flow in and out of the lungs.