Respiratory volumes and capacities Questions in English

(D) Residual volume is the volume of air remaining in the lungs even after a forcible expiration.
In mammals,including rabbits,this air is trapped within the $Alveoli$ because they are the terminal air sacs where gas exchange occurs and they cannot be completely emptied due to the structural support of the lungs and the presence of surfactant.

(D) Vital capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration. This includes the Inspiratory Reserve Volume $(IRV)$,Tidal Volume $(TV)$,and Expiratory Reserve Volume $(ERV)$. Mathematically,$VC = IRV + TV + ERV$. It represents the total amount of air that can be exhaled after a deep inspiration followed by a forcible expiration.

(C) The air that remains in the respiratory passage (such as the trachea and bronchi) and does not participate in gaseous exchange is known as the anatomical dead space. This volume of air is typically about $150 \ mL$. It is also commonly referred to as dead volume. Therefore,both terms are used to describe this trapped air.

(B) The volume of air remaining in the lungs even after a forceful expiration is known as the $Residual \ Volume$ $(RV)$.
This volume of air cannot be exhaled out of the lungs,even with maximum effort,because it prevents the collapse of the alveoli.
Therefore,the correct option is $B$.

(C) The correct answer is $C$.
Vital capacity is defined as the maximum volume of air a person can breathe out after a forced inspiration.
It includes the sum of tidal volume,inspiratory reserve volume,and expiratory reserve volume.
Mathematically,it is expressed as: $\text{Vital Capacity} = \text{Tidal Volume} + \text{Inspiratory Reserve Volume} + \text{Expiratory Reserve Volume}$.
Using standard values: $500 \, ml + 3000 \, ml + 1100 \, ml = 4600 \, ml$ (approx $4800 \, ml$ depending on the individual).

(B) Expiratory Reserve Volume $(ERV)$ is the additional volume of air that a person can expire by a forcible expiration.
This averages about $1000 \, ml$ to $1100 \, ml$ in a healthy adult human.
Among the given options,$1000 \, ml$ is the most accurate value.

(A) Vital Capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration.
It includes the Inspiratory Reserve Volume $(IRV)$,Tidal Volume $(TV)$,and Expiratory Reserve Volume $(ERV)$.
Mathematically,$VC = IRV + TV + ERV$.
In a healthy adult,the average values are approximately $IRV \approx 2500-3000 \, ml$,$TV \approx 500 \, ml$,and $ERV \approx 1000-1100 \, ml$.
Summing these values,$VC \approx 3000 + 500 + 1000 = 4500 \, ml$,which is approximately $4000-4600 \, ml$.
Among the given options,$4000 \, ml$ is the most accurate representation of the vital capacity.

(A) The Total Lung Capacity $(TLC)$ is defined as the total volume of air accommodated in the lungs at the end of a forced inspiration.
This includes the Vital Capacity $(VC)$ and the Residual Volume $(RV)$.
Mathematically, $TLC = VC + RV$ (or $IRV + TV + ERV + RV$).
For an average healthy human adult, the total lung capacity is approximately $5800 \, ml$ to $6000 \, ml$ $(5.8 - 6.0 \, liters)$.
Therefore, the correct option is $A$.

(D) Dead space air refers to the volume of air that remains in the respiratory passages (bronchial tree) and does not participate in gaseous exchange.
This volume is approximately $150 \, ml$ in a healthy adult.
Since this air does not reach the alveoli,it is not involved in the actual process of respiration.

(C) The correct answer is $C$.
$Tidal$ $volume$ is the volume of air inspired or expired during a single normal breath.
In a healthy adult human,this volume is approximately $500 \ mL$.

(D) The volume of air inspired or expired during a normal respiration is called Tidal Volume $(TV)$.
For a healthy adult human,the $TV$ is approximately $500\,ml$ per breath.
Therefore,$500\,ml$ respiratory volume corresponds to the Tidal volume.

(B) Tidal Volume $(TV)$ is defined as the volume of air inspired or expired during a normal respiration.
It is approximately $500 \ mL$ in a healthy adult human.
Therefore,it represents the air that normally goes in and comes out of the lungs during breathing.

(C) Functional Residual Capacity $(FRC)$ is the volume of air that remains in the lungs after a normal expiration.
It is calculated using the formula: $FRC = ERV + RV$.
Substituting the given values:
$FRC = 1100 \text{ ml} + 1200 \text{ ml} = 2300 \text{ ml}$.
Note: Tidal Volume $(TV)$ is not used in the calculation of $FRC$.

(D) The volume of air a person can expire after a normal inspiration is known as Expiratory Capacity $(EC)$.
$EC$ is the total volume of air a person can expire after a normal inspiration.
This includes Tidal Volume $(TV)$ and Expiratory Reserve Volume $(ERV)$.
Mathematically,$EC = TV + ERV$.

(A) The volume of air inspired or expired during a normal breath is known as Tidal Volume $(TV)$.
For a healthy adult,the $TV$ is approximately $500 \ mL$ per breath.

(C) The volume of air a person can expire after a normal inspiration is known as Expiratory Capacity $(EC)$.
It is calculated as the sum of Tidal Volume $(TV)$ and Expiratory Reserve Volume $(ERV)$.
$EC = TV + ERV$.
Total Lung Capacity $(TLC)$ is the total volume of air accommodated in the lungs at the end of a forced inspiration.
Functional Residual Capacity $(FRC)$ is the volume of air that will remain in the lungs after a normal expiration.
Vital Capacity $(VC)$ is the maximum volume of air a person can breathe in after a forced expiration,or breathe out after a forced inspiration.

(A) The approximate values for the respiratory volumes and capacities in a healthy human adult are as follows:
$(a)$ Tidal Volume $(TV)$: $\approx 500 \ mL$
$(b)$ Residual Volume $(RV)$: $\approx 1100-1200 \ mL$
$(c)$ Inspiratory Reserve Volume $(IRV)$: $\approx 2500-3000 \ mL$
$(d)$ Vital Capacity $(VC)$: $\approx 4600 \ mL$ $(TV + IRV + ERV)$
Comparing these values: $500 \ mL < 1200 \ mL < 3000 \ mL < 4600 \ mL$.
Therefore,the increasing order is $a < b < c < d$.

(C) The volume of air inspired or expired during a normal respiration is known as $Tidal \ Volume$ $(TV)$.
It is approximately $500 \ mL$ in a healthy adult human.
Inspiratory Capacity $(IC)$ is the total volume of air a person can inspire after a normal expiration.
Total Lung Capacity $(TLC)$ is the total volume of air accommodated in the lungs at the end of a forced inspiration.
Residual Volume $(RV)$ is the volume of air remaining in the lungs even after a forced expiration.

(D) After a maximum expiration,the volume of air that still remains in the lungs is known as the Residual Volume $(RV)$.
This volume of air cannot be exhaled even by a forceful expiration.
It helps in preventing the collapse of the alveoli during expiration.
Therefore,the correct option is $D$.

(C) The correct answer is $(C)$.
Total Lung Capacity $(TLC)$ is defined as the total volume of air accommodated in the lungs at the end of a forced inspiration.
It is calculated as the sum of Vital Capacity $(VC)$ and Residual Volume $(RV)$, or the sum of Inspiratory Reserve Volume $(IRV)$, Tidal Volume $(TV)$, Expiratory Reserve Volume $(ERV)$, and Residual Volume $(RV)$.
In a healthy adult human, the $TLC$ is approximately $5000 \text{ ml}$ to $6000 \text{ ml}$ (or $5-6 \text{ Liters}$).

(B) The correct matches are as follows:
$a.$ Tidal Volume $(TV)$: Volume of air inspired or expired during a normal respiration is approximately $500 \, mL$. $(a-iii)$
$b.$ Inspiratory Reserve Volume $(IRV)$: Additional volume of air, a person can inspire by a forcible inspiration is $2500$ to $3000 \, mL$. $(b-i)$
$c.$ Expiratory Reserve Volume $(ERV)$: Additional volume of air, a person can expire by a forcible expiration is $1000 \, mL$. $(c-ii)$
$d.$ Residual Volume $(RV)$: Volume of air remaining in the lungs even after a forcible expiration is $1200 \, mL$. $(d-v)$
$e.$ Vital Capacity $(VC)$: The maximum volume of air a person can breathe in after a forced expiration is $3400$ to $4800 \, mL$. $(e-iv)$
Thus, the correct sequence is $a-iii, b-i, c-ii, d-v, e-iv$.

(A) Vital Capacity $(VC)$ is the maximum volume of air a person can breathe in after a forced expiration. This includes Tidal Volume $(TV)$,Inspiratory Reserve Volume $(IRV)$,and Expiratory Reserve Volume $(ERV)$. Therefore,the formula is $VC = TV + IRV + ERV$.

(D) Residual volume $(RV)$ is the volume of air remaining in the lungs even after a forcible expiration.
Its value is approximately $1100 \ mL$ to $1200 \ mL$.
Tidal volume $(TV)$ is the volume of air inspired or expired during a normal respiration,which is approximately $500 \ mL$.
Since $1100-1200 \ mL > 500 \ mL$,the residual volume is greater than the tidal volume.

(A) The anatomical dead space refers to the volume of air that is inhaled but does not take part in gas exchange because it remains in the conducting airways (such as the nose,pharynx,larynx,trachea,and bronchi).
In a healthy adult,the volume of this anatomical dead space is approximately $150 \, CC$ (or $150 \, mL$).

(B) When a baby is born and takes its first breath, the lungs expand and fill with air.
Even after a forceful expiration, a certain volume of air remains in the lungs, which is known as the $Residual \text{ } Volume$ $(RV)$.
If the baby has never breathed, the lungs remain collapsed and do not contain any $Residual \text{ } Volume$.
Therefore, by testing the lungs for the presence of $Residual \text{ } Volume$ (often by checking if the lung tissue floats in water), it can be determined whether the baby had breathed or was stillborn.

(A) The maximum volume of air a person can breathe out after a forced inspiration is known as the $Vital \ Capacity$ $(VC)$.
It is calculated as the sum of $Inspiratory \ Reserve \ Volume$ $(IRV)$,$Tidal \ Volume$ $(TV)$,and $Expiratory \ Reserve \ Volume$ $(ERV)$.
$VC = IRV + TV + ERV$.
$Vital \ Capacity$ represents the total amount of air that can be moved in and out of the lungs during a deep breath.

(B) Vital Capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration.
It includes the Inspiratory Reserve Volume $(IRV)$,the Expiratory Reserve Volume $(ERV)$,and the Tidal Volume $(TV)$.
Mathematically,$VC = IRV + ERV + TV$.

(C) The volume of air remaining in the lungs even after a forceful expiration is known as the Residual Volume $(RV)$.
This volume prevents the lungs from collapsing and ensures that gas exchange continues even between breaths.
In a healthy adult,the Residual Volume is approximately $1100 \, ml$ to $1500 \, ml$.

(A) Residual volume $(RV)$ is the volume of air remaining in the lungs even after a forcible expiration. This air is primarily trapped within the $Alveoli$ because they are the terminal air sacs where gas exchange occurs and they do not collapse completely due to the presence of surfactant and the structural arrangement of the lungs. Therefore,the correct answer is $Alveoli$.

(B) Vital Capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration.
It includes the Inspiratory Reserve Volume $(IRV)$,Tidal Volume $(TV)$,and Expiratory Reserve Volume $(ERV)$.
Mathematically,$VC = IRV + TV + ERV$.
Since Total Lung Capacity $(TLC)$ is the sum of all lung volumes including Residual Volume $(RV)$,i.e.,$TLC = VC + RV$,we can derive that $VC = TLC - RV$.

(A) The respiratory volumes and capacities in a healthy adult human are as follows:
$1$. Tidal Volume $(TV)$: Approximately $500 \ mL$.
$2$. Inspiratory Reserve Volume $(IRV)$: Approximately $2500 \ mL$ to $3000 \ mL$.
$3$. Expiratory Reserve Volume $(ERV)$: Approximately $1000 \ mL$ to $1100 \ mL$.
$4$. Vital Capacity $(VC)$: Approximately $4000 \ mL$ to $4600 \ mL$.
Comparing these values,$TV$ $(500 \ mL)$ is the lowest among the given options.

(D) The correct answer is $D$.
Residual volume is the volume of air that remains in the lungs even after a forceful expiration.
This volume of air ensures that the lungs do not collapse during the process of breathing.
It also allows for the continuous exchange of gases between the blood and the alveoli even when no more air can be exhaled.

(C) The correct matching is $(iv) 3500 \; mL$ and $(i) 1200 \; mL$.
$1$. Residual Volume $(RV)$: The volume of air remaining in the lungs even after a forcible expiration. It is approximately $1100 \; mL$ to $1200 \; mL$.
$2$. Vital Capacity $(VC)$: The maximum volume of air a person can breathe in after a forced expiration. It is approximately $3500 \; mL$ to $4600 \; mL$.
$3$. Inspiratory Reserve Volume $(IRV)$: Additional volume of air,a person can inspire by a forcible inspiration. It is approximately $2500 \; mL$ to $3000 \; mL$.
$4$. Inspiratory Capacity $(IC)$: Total volume of air a person can inspire after a normal expiration. It is $TV + IRV$ (approx $500 \; mL + 3000 \; mL = 3500 \; mL$).
Comparing these with the given options,$(iv)$ Inspiratory capacity matches $3500 \; mL$ and $(i)$ Residual volume matches $1200 \; mL$.

(B) The correct answer is $B$.
Vital capacity $(VC)$ is the maximum volume of air a person can breathe in after a forced expiration.
It is the sum of tidal volume $(TV)$,inspiratory reserve volume $(IRV)$,and expiratory reserve volume $(ERV)$.
Total lung capacity $(TLC)$ is the total volume of air accommodated in the lungs at the end of a forced inspiration,which includes $VC$ and residual volume $(RV)$.
Therefore,$TLC = VC + RV$,which implies $VC = TLC - RV$.

(C) is true: Gas exchange between the blood and the alveolar air occurs continuously because the lungs never completely collapse.
$R$ is true: Even after a forceful expiration,some volume of air remains in the lungs,which is known as the Residual Volume $(RV)$.
This residual air ensures that the lungs do not collapse and that gas exchange can continue even during the expiratory phase of breathing.
Therefore,$R$ is the correct explanation for $A$.

(A) Functional Residual Capacity $(FRC)$ is defined as the volume of air that will remain in the lungs after a normal expiration.
It includes the Expiratory Reserve Volume $(ERV)$ and the Residual Volume $(RV)$.
Therefore,the formula is $FRC = ERV + RV$.

(B) Functional Residual Capacity $(FRC)$ is defined as the volume of air that remains in the lungs after a normal expiration.
It is the sum of Expiratory Reserve Volume $(ERV)$ and Residual Volume $(RV)$.
Mathematically,$FRC = ERV + RV$.
In the given options,$RV$ corresponds to $(3)$ and $ERV$ corresponds to $(4)$.
Therefore,the correct combination is $(3)$ and $(4)$.

(C) The standard respiratory volumes and capacities for a normal human adult are:
$1$. Residual Volume $(RV)$: $1100-1200 \, mL$.
$2$. Inspiratory Reserve Volume $(IRV)$: $2500-3000 \, mL$.
$3$. Inspiratory Capacity $(IC)$: $IRV + TV = 3000-3500 \, mL$.
$4$. Vital Capacity $(VC)$: $IRV + TV + ERV = 3500-4500 \, mL$.
Comparing the given values:
$(i)$ $RV$ is $1100-1200 \, mL$.
(ii) $VC$ is $3500-4500 \, mL$.
(iii) $IRV$ is $2500-3000 \, mL$.
(iv) $IC$ is $3000-3500 \, mL$.
Based on the options provided,the correct matching is $(iii) 2500-3000 \, mL$ (which is $IRV$) and $(i) 1100-1200 \, mL$ (which is $RV$).

(B) spirometer is an instrument used to measure the volume of air inspired and expired by the lungs.
It can measure tidal volume $(TV)$,inspiratory reserve volume $(IRV)$,and expiratory reserve volume $(ERV)$.
It can also measure capacities derived from these,such as inspiratory capacity $(IC = TV + IRV)$.
However,it cannot measure residual volume $(RV)$,which is the volume of air remaining in the lungs even after a forcible expiration.
Since $RV$ cannot be exhaled,it cannot be measured by direct spirometry.

(C) The Vital Capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration.
It includes the Tidal Volume $(TV)$,Inspiratory Reserve Volume $(IRV)$,and Expiratory Reserve Volume $(ERV)$.
Mathematically,$VC = TV + IRV + ERV$.
Therefore,the correct option is $C$.

(D) The $TLC$ (Total Lung Capacity) of a healthy adult human is approximately $5,000 \text{ mL}$ to $6,000 \text{ mL}$ ($5$ to $6 \text{ liters}$).
Given that the man breathes $12$ times in a minute and achieves $2$ times the $TLC$ in total volume inspired:
Total volume inspired = $12 \times (2 \times TLC)$.
If we take $TLC = 5,000 \text{ mL}$,then $12 \times (2 \times 5,000) = 120,000 \text{ mL}$.
If we take $TLC = 6,000 \text{ mL}$,then $12 \times (2 \times 6,000) = 144,000 \text{ mL}$.
Since the calculated values ($120,000 \text{ mL}$ to $144,000 \text{ mL}$) do not match any of the provided options $(A, B, C)$,the correct answer is $D$.

(D) Let us analyze the respiratory volumes and capacities:
$1$. $EC$ (Expiratory Capacity) = $TV + ERV$. Thus,option $A$ is incorrect.
$2$. $TV$ (Tidal Volume) is a primary volume,not the sum of $ERV$ and $IC$. Thus,option $B$ is incorrect.
$3$. $IRV$ (Inspiratory Reserve Volume) is generally between $2500-3000 \ ml$. Thus,option $C$ is incorrect as the range provided in the original option was inaccurate.
$4$. $ERV$ (Expiratory Reserve Volume) is the additional volume of air a person can expire by a forcible expiration,which is approximately $1000-1100 \ ml$. Thus,option $D$ is correct.

(B) The volume of air inspired or expired during a normal respiration is called Tidal Volume $(TV)$.
For a healthy human,the $TV$ is approximately $500 \, ml$.
The number of breaths per minute in a healthy human is $12$ to $16$ times.
To calculate the minute ventilation (volume of air breathed per minute),we multiply the $TV$ by the breathing rate:
Lower limit: $500 \, ml \times 12 = 6000 \, ml$
Upper limit: $500 \, ml \times 16 = 8000 \, ml$
Thus,a healthy human breathes approximately $6000$ to $8000 \, ml$ of air per minute.

(C) The Inspiratory Reserve Volume $(IRV)$ is the additional volume of air a person can inspire by a forcible inspiration.
Its average value ranges from $2500 \text{ mL}$ to $3000 \text{ mL}$ or sometimes cited as $3000 \text{ mL}$ to $3500 \text{ mL}$ in various standard textbooks.
$IC$ (Inspiratory Capacity) is $TV + IRV \approx 500 + 3000 = 3500 \text{ mL}$.
$ERV$ (Expiratory Reserve Volume) is $1000 \text{ mL}$ to $1100 \text{ mL}$.
$VC$ (Vital Capacity) is $IRV + TV + ERV \approx 4500 \text{ mL}$.
Given the options,$IRV$ is the most appropriate answer for the range $3000-3500 \text{ mL}$.

(A) The Inspiratory Reserve Volume $(IRV)$ is the additional volume of air a person can inspire by a forcible inspiration. Its value is approximately $2500-3000\, ml$.
$RV$ (Residual Volume) is the volume of air remaining in the lungs even after a forcible expiration,which is about $1100-1200\, ml$.
$ERV$ (Expiratory Reserve Volume) is the additional volume of air a person can expire by a forcible expiration,which is about $1000-1100\, ml$.
$IC$ (Inspiratory Capacity) is the total volume of air a person can inspire after a normal expiration $(TV + IRV)$,which is about $3000-3500\, ml$.

(B) Expiratory Capacity $(EC)$ is defined as the total volume of air a person can expire after a normal inspiration.
This includes Tidal Volume $(TV)$ and Expiratory Reserve Volume $(ERV)$.
Therefore,the formula is $EC = TV + ERV$.

(C) The Expiratory Reserve Volume $(ERV)$ is defined as the additional volume of air that a person can expire by a forcible expiration.
This averages about $1000 \, ml$ to $1100 \, ml$ in some contexts,but in many standard physiology references,it is cited as approximately $1500 \, ml$ depending on the individual's lung capacity.
Residual Volume $(RV)$ is the volume of air remaining in the lungs even after a forcible expiration,which is approximately $1100 \, ml$ to $1200 \, ml$.
Total Lung Capacity $(TLC)$ is the total volume of air accommodated in the lungs at the end of a forced inspiration,which is approximately $5000 \, ml$ to $6000 \, ml$.
Therefore,$1500 \, ml$ is most appropriately associated with the Expiratory Reserve Volume $(ERV)$ in this context.

(D) Vital Capacity $(VC)$ is defined as the maximum volume of air a person can breathe in after a forced expiration.
It includes the Expiratory Reserve Volume $(ERV)$,Tidal Volume $(TV)$,and Inspiratory Reserve Volume $(IRV)$.
Mathematically,$VC = ERV + TV + IRV$.
Since Total Lung Capacity $(TLC)$ is the sum of all lung volumes including Residual Volume $(RV)$,i.e.,$TLC = IRV + TV + ERV + RV$,we can derive that $VC = TLC - RV$.

(C) The standard respiratory volumes and capacities for a healthy adult human are as follows:
$1$. Residual Volume $(RV)$: The volume of air remaining in the lungs even after a forcible expiration. It is approximately $1100$ $mL$ to $1200$ $mL$.
$2$. Vital Capacity $(VC)$: The maximum volume of air a person can breathe in after a forced expiration. It is approximately $3500$ $mL$ to $4500$ $mL$.
$3$. Inspiratory Reserve Volume $(IRV)$: Additional volume of air, a person can inspire by a forcible inspiration. It is approximately $2500$ $mL$ to $3000$ $mL$.
$4$. Inspiratory Capacity $(IC)$: Total volume of air a person can inspire after a normal expiration. It is approximately $3000$ $mL$ to $3500$ $mL$.
Comparing the given values:
$(i)$ $RV = 1200$ $mL$
$(ii)$ $VC = 3500$ $mL$ to $4500$ $mL$
$(iii)$ $IRV = 2500$ $mL$ to $3000$ $mL$
$(iv)$ $IC = 3000$ $mL$ to $3500$ $mL$
Looking at the options provided, option $(C)$ matches $(iv)$ Inspiratory Capacity with $3500$ $mL$ and $(i)$ Residual Volume with $1200$ $mL$, which are both within the standard physiological ranges.

(A) The lungs do not collapse even after a forceful expiration because of the presence of Residual Volume $(RV)$.
$RV$ is the volume of air remaining in the lungs even after a forcible expiration.
This residual air prevents the alveoli from collapsing and ensures that there is a continuous exchange of gases even between breaths.