   Chapter 2, Problem 2RQ

Chapter
Section
Textbook Problem

Normally, the airway resistance in the tracheobronchial tree is aboutA. 0.5-1.5 cm H2O/L/sec.B. 1.0-2.0 cm H2O/L/sec.C. 2.0-3.0 cm H2O/L/sec.D. 3.0-4.0 cm H2O/L/sec.

Summary Introduction

Introduction:

The airway resistance is the pressure difference between the mouth and the alveoli divided by the flow rate. The tracheobronchial airways are the site from where gas flows, and the rate at which a certain volume of gas flows through it is a function of the resistance in the airways and the pressure gradient.

The airway resistance is denoted as Raw, and measured in centimeters of water per liter per second. The flow rate is expressed in volume per second. The value of airway resistance is much higher in the newborns than in the adults. It is also higher in case of chronic bronchitis where inflammation of the bronchi occurs.

Airway resistance=change in pressure (ΔP) (cm H2O)volume (L/sec)

Explanation

Justification/ Explanation for the correct answer:

Option (a) is given 0.5 to 1.5cm H2O/L/ sec. The tracheobronchial trees are the branches of airways arising from the beginning of the larynx which extend to the interior and the periphery of the lungs. Hence, option (a) is the correct answer.

The explanation for the incorrect answers:

Option (b) is given 1.0 to 2.0 cm H2O/L/sec. The tracheobronchial tree has an airway resistance of 0.5 to 1.5 cm H2O/L/sec. The airway resistances increase in case of chronic bronchitis...

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