Question

Mark the correct option:
(i) Inspiratory capacity (IC) = Tidal volume + Residual volume
(ii) Vital capacity (VC) = Tidal volume (TV) + Inspiratory reserve volume (IRV) + Expiratory reserve volume (ERV)
(iii) Residual volume (RV) = Vital capacity (VC) + Inspiratory reserve volume (IRV)
(iv) Tidal volume (TV) = Inspiratory capacity (IC) – Inspiratory reserve volume (IRV)

• A. (i) Incorrect, (ii) Incorrect,
  (iii) Incorrect, (iv) Correct
• B. (i) Incorrect, (ii) Correct,
  (iii) Incorrect, (iv) Correct
• C. (i) Correct, (ii) Correct,
  (iii) Incorrect, (iv) Correct
• D. (i) Correct, (ii) Incorrect (iii) Correct, (iv) Incorrect

Answer 1

The correct option is B (i) Incorrect, (ii) Correct,

(iii) Incorrect, (iv) Correct
(i) Inspiratory capacity (IC): Tidal volume + Inspiratory reserve volume (TV+IRV).

(ii) Vital capacity (VC): Tidal volume + Inspiratory reserve volume + Expiratory reserve volume (TV+ERV+IRV).

(iii) Residual volume (RV): Volume of air remaining in the lungs even after a forcible expiration.

(iv) Tidal volume: Volume of air inspired or expired during normal respiration.