MCQ

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From the following relationships between respiratory volume and capacities and mark the correct answer:

1. Inspiratory capacity $\text{(IC)} =$ Tidal Volume $+$ Residual Volume.
2. Vital Capacity $\text{(VC)} =$ Tidal Volume $\text{(TV)} +$ Inspiratory Reserve Volume $\text{(IRV) +}$ Expiratory Reserve Volume $\text{(ERV).}$
3. Residual Volume $\text{(RV)} =$ Vital Capacity $\text{(VC)} –$ Inspiratory Reserve Volume $\text{(IRV).}$
4. Tidal Volume $\text{(TV)} =$ Inspiratory Capacity $\text{(IC)} –$ Inspiratory Reserve Volume $\text{(IRV).}$

Options:

• A
  $(i)$ Incorrect, $(ii)$ Incorrect, $(iii)$ Incorrect, $(iv)$ Correct.
• ✓
  $(i)$ 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.