This "mucociliary escalator" is one of the principal defenses against lung infection.
Postural drainage is used to allow gravity to aid the mucociliary escalator.
Mucociliary escalator-The coordinated action of tiny projections on the surfaces of cells lining the respiratory tract, which moves mucus up and out of the lungs.
This mechanism of protection is referred to as the mucociliary escalator.
In a healthy person, this is normally accomplished through two mechanisms: the mucociliary clearance system (MCS) and the ability to cough.