According to Poiseuille's law, which of the following statements is true if we wish to maintain a constant flow of gases?

Question

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For gas flow to remain constant, delivery pressure must vary inversely with the fourth power of the airway's radius. Reducing the radius of a tube by half requires a 16-fold pressure increase to maintain a constant flow. To maintain ventilation in the presence of narrowing airways, large increases in driving pressure may be needed. The energy necessary to generate these pressures can markedly increase the work of breathing.

According to Poiseuille's Law, Which of the Following Statements Is