When you discuss the mechanics of breathing, which expression of Poiseuille's law do you use?
a. P = ? R c. = P ÷ R
b. = P ÷ R d. = 1/
ANS: C
Poiseuille's law states that the pressure gradient required to cause a liquid to move through a tube is equal to the flow of the liquid through the tube multiplied by the resistance to flow. In a dis-cussion of gases, the term flow of the liquid is replaced with flow of the gas. Therefore, the flow of the gas is equal to the pressure gradient divided by the resistance to flow.
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