vng lab act 4 Flashcards
a force that involves the tissues of the lungs, thorax, and abdomen, along with surface tension in alveoli
elastic force
it includes resistance caused by gas flow through natural or artificial airways and tissue movement during breathing
frictional force
the physical tendency of an object to return to an initial state after deformation
elasticity
tendency of a liquid to minimize area of its surface by contracting
surface tension
it is caused by tissue elastic forces and surface tension that oppose lung inflation ; change of volume per unit in pressure
compliance
when lungs have the same driving pressure but different flows
parallel compliance
the total lung and chest wall compliance have different driving pressures but the same flow
series compliance
a resistance to ventilation by the movement of gas through the airways
airway resistance
the impedance of motion caused by displacement of tissues during ventilation
tissue viscous resistance
a pattern of flow consisting of concentric layers of fluid flowing parallel to the tube wall at linear velocities that increase toward the enter
laminar flow
a flow of fluid that does not occur in straight line ; flow in which molecules tube over each other
turbulent flow
a combination of laminar and turbulent flow
tracheobronchial flow
the flow throughout the respiratory system has ceased and all ventilatory muscle activity is absent
static mechanics
the flow at the airway opening is zero
dynamic mechanics
