Question: 157: 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:
(1) (b), (d) and (e)
(2) (a), (c) and (d)
(3) (a), (c) and (e)
(4) (a) and (e)
Answer: Option (3)
Explanation:
Vital capacity is the maximum volume of air that a person can breathe in or breathe out during a respiratory cycle involving forced breathing.
Vital capacity includes expiratory reserve volume, tidal volume, and inspiratory reserve volume.
Hence, statement (a) is correct.
The maximum volume of air a person can breathe in after a forced expiration is equal to the vital capacity.
Therefore, statement (c) is correct.
The maximum volume of air a person can breathe out after a forced inspiration also represents vital capacity.
Thus, statement (e) is correct.
Residual volume is not included in vital capacity, so statement (d) is incorrect.
Statement (b) describes inspiratory capacity, not vital capacity.
Hence, the correct set of statements is (a), (c), and (e).