Air a/< Palv> Patm Inspiration Expiration F=ay二 atm R Airflow(F)is a function of the pressure differences between the alveoli(Palv)and the atmosphere( Patm) divided by airflow resistance(R). Air enters the lungs when Paly Patm Air exits the lungs when Palv PatAirflow (F) is a function of the pressure differences between the alveoli (Palv) and the atmosphere (Patm) divided by airflow resistance (R). Air enters the lungs when Palv < Patm Air exits the lungs when Palv > Patm