   Chapter 2, Problem 13RQ

Chapter
Section
Textbook Problem

If alveolar unit A has one-half the compliance of alveolar unit B, then the1. time constant of unit A is essentially the same as that of unit B.2. volume in unit B is two times greater than volume in unit A.3. time constant of unit B is twice as long as that of unit A.4. volume in unit B is essentially the same as the volume of unit A.A. 1 onlyB. 3 onlyC. 4 onlyD. 2 and 3 only

Summary Introduction

Introduction:

The time constant (Tc) is the product of airway resistance (Raw) and lung compliance (CL) and is defined as the time taken to inflate a particular region of the lung to about 60% of its potential filling capacity.

The volume and rate inflated are dependent upon the equation:

TC(sec)=ΔP(cmH2O)V(L/sec)×ΔV(L)ΔP(cmH2O)

Explanation

Explanation/justification for the correct answer:

Option (d) states that the time taken by and the volume inflated for alveolar unit A is half that of alveolar unit B. This statement is correct because if the compliance of the alveolar unit A is reduced by half, then the time constant as well as potential filling capacity of the lungs of alveolar unit A are also reduced by half. Lung compliance is directly proportional to the time constant and volume. Hence, option (d) is correct.

The explanation for incorrect answer:

Option (a) states that the time constant (Tc) of unit A is the same as that of unit B. The time constant (Tc) of alveolar unit A can only be same as that of unit B if both the alveolar components have the identical airway resistance (Raw) and lung compliance (CL)...

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