The equation of motion describes the relationships between which of the following?
a. Pressure and flow during a mechanical breath
b. Pressure and volume during a spontaneous breath
c. Flow and volume during a mechanical or spontaneous breath
d. Flow, volume, and pressure during a spontaneous or mechanical breath
ANS: D
The mathematical model that relates pressure, volume, and flow during ventilation is known as the equation of motion for the respiratory system. This means that: Muscle pressure + Ventilator pressure = (Elastance ? Volume) + (Resistance ? Flow).
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