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Question

The inspiratory reserve volume + tidal volume + expiratory reserve volume is the same as

A

Inspiratory capacity + expiratory reserve volume

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B

Total lung capacity - functional residual capacity

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C

Inspiratory capacity + functional residual capacity

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D

Inspiratory capacity + residual volume.

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Solution

The correct option is B Inspiratory capacity + expiratory reserve volume
Inspiratory reserve volume (IRV) + tidal volume (TV) + expiratory reserve volume (ERV) represents vital capacity (VC).
Now, inspiratory capacity is the total volume of air that can be inhaled after a normal expiration. It includes tidal volume and inspiratory reserve volume i.e., IC = TV + IRV.
Thus, option (a) is correct which says that vital capacity/.e., IRV + TV + ERV = IC + ERV.

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Q. 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)

Q. In the following functional human lung studies, identify the total lung capacity.
A) Inspiratory capacity (IC)
B) Functional residual capacity (FRC)
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I	Inspiratory Capacity (IC)
II	Functional Residual Capacity (FRC)
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IV	Inspiratory Reserve Volume (IRV)
V	Residual Volume RV)
VI	Expiratory Reserve Volume (ERV)
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