Question

Inspiratory capacity is:

• A. TV + IRV + ERV
• B. TV + IRV
• C. VC + RV
• D. ERV + RV

Hint:

Understanding lung volumes and capacities can help in diagnosing respiratory conditions and assessing lung health in clinical practice.

Answer 1

The Correct Option is B

To solve the problem, we need to determine the formula for Inspiratory Capacity (IC).

1. Understanding Inspiratory Capacity (IC):
Inspiratory Capacity is the maximum amount of air a person can inhale after normal exhalation. It is calculated by adding the Tidal Volume (TV) and the Inspiratory Reserve Volume (IRV).

2. Analyzing the Options:
(1) TV + IRV + ERV: This is incorrect because Inspiratory Capacity is not the sum of Tidal Volume, Inspiratory Reserve Volume, and Expiratory Reserve Volume. This combination gives a different respiratory volume.
(2) TV + IRV: This is the correct formula for Inspiratory Capacity. It is the sum of Tidal Volume (TV) and Inspiratory Reserve Volume (IRV), representing the volume of air that can be inspired after normal exhalation.
(3) VC + RV: This combination refers to Vital Capacity and Residual Volume, which are not part of the Inspiratory Capacity.
(4) ERV + RV: This combination refers to the Expiratory Reserve Volume and Residual Volume, which are also not part of the Inspiratory Capacity.

3. Identifying the Correct Answer:
The correct formula for Inspiratory Capacity is TV + IRV.

Final Answer:
The correct answer is Option B: TV + IRV.