The most important factor to affect the degree of resistance in the airways is which of the fol-lowing?
a. Flow rate of the gas
b. Viscosity of the gas
c. Length of the airways
d. Diameter of the airways
ANS: D
The most important factor affecting the degree of airway resistance is the diameter of the air-ways. The mathematical law that determines this fact is Poiseuille's law. A large diameter airway will have low airway resistance and there will be a greater flow of gas. A small diameter airway will have high resistance and there will be a lower flow.
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