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Q.

Which of the following statements are correct with respect to vital capacity?
A. It includes ERV, TV and IRV. 
B. Total volume of air a person can inspire after a normal expiration 
C. The maximum volume of air a person can breathe in after forced expiration 
D. It includes ERV, RV and IRV. 
E. The maximum volume of air a person can breath out after a forced inspiration. 
Choose the most appropriate answer from the options given below. 

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a

B, D, E 

b

A and E

c

A, C and E

d

A, C and D  

answer is C.

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Detailed Solution

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A, C and E are correct. B and D are incorrect. 

A. Vital capacity (VC) is the maximum amount of air a person can exhale after taking the deepest possible breath. It
includes three components: expiratory reserve volume (ERV), tidal volume (TV), and inspiratory reserve volume (IRV).

B. Total volume of air a person can inspire after a normal expiration is termed inspiratory capacity (IC), not vital capacity. 

C. Vital capacity represents the maximum amount of air a person can inhale (inspiratory capacity) after exhaling
as much air as possible during forced expiration.

D. Vital capacity does not include residual volume (RV), which is the volume of air remaining in the lungs after a maximal expiration. Vital capacity only includes expiratory reserve volume (ERV), tidal volume (TV), and inspiratory reserve volume (IRV).

E. Vital capacity represents the maximum amount of air a person can exhale (expiratory reserve volume) after taking
the deepest possible breath (inspiratory reserve volume).

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