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Question

Which of the following is/are true about Inspiratory Reserve Volume (IRV)?
  1. It is the additional volume of air a person can inspire by a forceful inspiration.
  2. It is about 3500 ml.
  3. IRV and Tidal Volume together make up Inspiratory Capacity.
  4. IRV and ERV are the same.


Solution

The correct options are
A It is the additional volume of air a person can inspire by a forceful inspiration.
C IRV and Tidal Volume together make up Inspiratory Capacity.
Inspiratory Reserve Volume (IRV) is the additional volume of air a person can inspire by a forceful inspiration. It is about 3000 ml. Inspiratory Capacity (IC) includes IRV and Tidal Volume (TV), and adds up tp 3500 ml. Expiratory Reserve Volume (ERV) is the additional volume of air, a person can expire by a forcible expiration, and is about 1200 ml. 

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