Author Question: Which of the following statements about Raw is true? a. The greater the lung volume, the greater ... (Read 51 times)

viki · **on:** Jul 16, 2018

Which of the following statements about Raw is true?

a. The greater the lung volume, the greater is the Raw.
b. The greater the lung volume, the less is the Raw.
c. As lung volume decreases toward RV, the Raw drops.
d. As lung volume increases toward TLC, the Raw rises.

Question 2

Which of the following factors affects Raw? 1. Pattern of gas flow (e.g., laminar vs. turbulent) 2. Characteristics of the gas being breathed 3. Diameter and length of the airways 4. Variations in lung compliance

a. 1, 2, and 3 only
b. 2 and 4 only
c. 4 only
d. 1, 2, 3, and 4

frre432 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
The increase in airway diameter with increasing lung volume decreases airway resistance.

Answer to Question 2

ANS: A
Laminar flow is affected by gas flow, viscosity of the gas, tube radius, and length. Turbulent flow is most affected by gas density and viscosity, linear velocity, and tube radius.