Question

Identify the marked region in the given spirometry.

• A. Functional residual capacity
• B. Tidal volume
• C. Expiratory reserve volume
• D. Expiratory capacity

Answer 1

The Correct Option is A

To identify the marked region in the presented spirometry, we need to understand the components involved in lung volumes and capacities. Spirometry is a test that measures lung function, specifically the volume and/or speed of air that can be inhaled and exhaled. Here's a brief explanation of the given options:

• Functional Residual Capacity (FRC): This is the volume of air present in the lungs at the end of passive expiration. It is the sum of Expiratory Reserve Volume (ERV) and Residual Volume (RV).
• Tidal Volume (TV): This is the amount of air inhaled or exhaled during normal breathing.
• Expiratory Reserve Volume (ERV): This is the additional amount of air that can be exhaled after a normal exhalation.
• Expiratory Capacity (EC): This is the total volume of air that can be exhaled after a normal inhalation, calculated as Tidal Volume plus Expiratory Reserve Volume (TV + ERV).

In the context given, the correct answer is Functional Residual Capacity (FRC), as it represents the volume of air remaining in the lungs after a normal expiration.