According to Poiseuille's law, which of the following statements ...

[ereecah]

According to Poiseuille's law, which of the following statements is true if we wish to maintain a constant flow of gases?
 
  a. Alveolar recruitment has its greatest effect on flow.
  b. Halving the tube radius will require a 16-time increase in driving pressure.
  c. Large jumps in driving pressure are need-ed to overcome airway narrowing.
  d. The driving pressure varies directly with the airway circumference.

Question 2

What is the term for the impedance to ventilation caused by the movement of gas through the conducting system of the lungs?
 
  a. Airway resistance
  b. Lung compliance
  c. Surface tension
  d. Tissue elastance

[xMRAZ]

Answer to Question 1

ANS: B
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 in-creases in driving pressure may be needed. The energy necessary to generate these pressures can markedly increase the work of breathing.

Answer to Question 2

ANS: A

[ereecah]

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