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

i. Inspiratory capacity $(I C) =$ Tidal Volume + Residual Volume
ii. Vital Capacity $(V C) =$ Tidal Volume $(T V) +$ Inspiratory Reserve Volume $(I R V) +$ Expiratory Reserve Volume $(E R V)$
iii. Residual Volume $(R V) =$ Vital Capacity $(V C) -$ Inspiratory Reserve Volume $(I R V)$
iv. Tidal Volume $(T V) =$ Inspiratory Capacity $(I C) -$ Inspiratory Reserve Volume $(I R V)$

(i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct

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(i) Incorrect, (ii) Incorrect, (iii) Incorrect, (iv) Correct

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(i) Correct, (ii) Correct, (iii) Incorrect, (iv) Correct

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(i) Correct, (ii) Incorrect, (iii) Correct, (iv) Incorrect

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Solution

The correct option is A (i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct
Inspiratory capacity $(I C)$ :

The total volume of air that can be inspired after a normal expiration. It is the sum of the Tidal volume and the Inspiratory reserve volume.
$I C = T V + I R V$

Vital capacity $(V C)$ :

Vital capacity is defined as the maximum volume of air a person can breathe in after a forceful expiration or the maximum volume of air that can be breathed out by a person after forceful inspiration.
It is calculated by summing tidal volume, inspiratory reserve volume, and expiratory reserve volume.
$V C = T V + E R V + I R V$

Residual volume $(R V)$ :

The volume of air that remains in the lungs even after a forceful expiration is known as residual volume. It is calculated by subtracting the vital capacity from the total lung capacity.
$R V = T L C - V C$

Tidal Volume $(T V)$ :

During normal breathing, the volume of air inspired or expired by a person is known as tidal volume. It can be calculated by subtracting the Inspiratory reserve volume from the Inspiratory capacity.
$T V = I C - I R V$

Final answer : b. (i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct

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Similar questions

From the following relationships between respiratory volume and capacities, 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)

Codes

(a) (i) Incorrect, (ii) incorrect, (iii) incorrect, (iv) Correct

(b) (i) Incorrect, (ii) Correct, (iii) incorrect, (iv) Correct

(d) (i) Correct, (ii) Incorrect, (iii) Correct, (iv) Incorrect

Differentiate between

(a) Inspiratory and expiratory reserve volume

(b) Vital capacity and total lung capacity.

I	Inspiratory Capacity (IC)
II	Functional Residual Capacity (FRC)
III	Vital Capacity (VC)
IV	Inspiratory Reserve Volume (IRV)
V	Residual Volume RV)
VI	Expiratory Reserve Volume (ERV)
VII	Tidal Volume (TV)

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