Which of the following factors affects Raw? 1. Pattern of gas flow (e.g., laminar vs. turbulent) 2. Characteristics of the gas being breathed 3. Diameter and length of the airways 4. Variations in lung compliance
a. 1, 2, and 3 only
b. 2 and 4 only
c. 4 only
d. 1, 2, 3, and 4
ANS: A
Laminar flow is affected by gas flow, viscosity of the gas, tube radius, and length. Turbulent flow is most affected by gas density and viscosity, linear velocity, and tube radius.
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