Which of the following terms describes gas characterized by a parabolic gas profile during one phase of the ventilatory cycle and a square profile during the other phase?
A. Taylor dispersion
B. coaxial flow
C. molecular diffusion
D. Pendelluft
ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Coaxial flow results if the gas-flow profile during one phase of the ventilatory cycle is parabolic and during the other phase is square, a net flow of gas can occur in one direction through the center of the airway and in the other direction via the periphery.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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