Upon compression, two forces in the alveoli and dead space balance
Pamb, (1) the pressure exerted by the air inside the closed
respiratory system being compressed (Pint) and (2) the pressure
due to the structural properties of the alveoli and dead space (PA,S
and PD,S, respectively). The alveoli and dead space compress until
a steady state is achieved where PA,S or PD,S and Pint balance Pamb.
Therefore, in the alveoli