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Question

Which of the following is not true with respect to respiratory volumes and capacity?

A
IC = TV + IRC
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B
EC = TV + ERC
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C
FRC = ERV + RV
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D
VC = RV + ERV + TV + IRV
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Solution

The correct option is D VC = RV + ERV + TV + IRV
Tidal Volume (TV): Volume of air inspired or expired during a normal respiration.
Inspiratory Reserve Volume (IRV): Additional volume of air, a person can inspire by a forcible inspiration.
Expiratory Reserve Volume (ERV ): Additional volume of air, a person can expire by a forcible expiration.
Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration.
IC =TV + IRV
Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration.
EC =TV + ERV
Functional Residual Capacity (FRC): Volume of air that will remain in the lungs after a normal expiration.
FRC =ERV + RV.
Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV.
Total Lung Capacity: Total volume of air accommodated in the lungs at the end of a forced inspiration. This includes RV, ERV, TV and IRV.

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