Multiple Choice
Which of the following factors primarily determines lung compliance?
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22. The Respiratory System
Lung Volumes and Capacities
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In pulmonary physiology, total lung capacity (TLC) is calculated by combining which lung volumes/capacities?
A
Inspiratory capacity (IC) plus expiratory reserve volume (ERV)
B
Vital capacity (VC) plus residual volume (RV)
C
Expiratory reserve volume (ERV) plus residual volume (RV)
D
Tidal volume (TV) plus inspiratory reserve volume (IRV)
Verified step by step guidance1
Step 1: Understand the definition of Total Lung Capacity (TLC). TLC is the maximum amount of air the lungs can hold after a maximal inhalation.
Step 2: Recall the components of lung volumes and capacities. Vital Capacity (VC) is the total amount of air that can be exhaled after a maximal inhalation, and Residual Volume (RV) is the air remaining in the lungs after maximal exhalation.
Step 3: Recognize that TLC is the sum of all lung volumes, which includes the air that can be voluntarily moved (VC) plus the air that remains in the lungs (RV).
Step 4: Write the formula for TLC as the sum of Vital Capacity and Residual Volume: \(\text{TLC} = \text{VC} + \text{RV}\).
Step 5: Confirm that other combinations like Inspiratory Capacity plus Expiratory Reserve Volume or Tidal Volume plus Inspiratory Reserve Volume do not account for the residual volume, and thus do not represent the total lung capacity.
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