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Standard VI

Biology

Parts of the Respiratory System

During a brea...

Question

During a breathing cycle, why do lungs always contain a residual volume of air in it?

It makes O₂transport efficient and faster.

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It helps in CO₂release slower and O₂ transport faster.

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It gives sufficient time for CO₂ absorption and O₂release.

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It gives sufficient time for O₂ absorption and CO₂release.

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Solution

The correct option is D
It gives sufficient time for O₂ absorption and CO₂release.

During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.

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Similar questions

Q. Respiration involves following steps:
A. Diffusion of gases

O_{2}

and

{C O}_{2}

across alveolar membrane.
B. Transport of gases by blood.
C. Utilization of

O_{2}

by cell for catabolic reaction and resultant release of

O_{2}

.
D. Pulmonary ventilation by which atmospheric air is drawn in and

{C O}_{2}

rich air is released out.
E. Diffusion of

O_{2}

and

{C O}_{2}

between blood and tissue.

For completion of respiration process, write the given steps in sequential manner.

(a) Diffusion of gases $(O_{2} a n d C O_{2})$ across alveolar membrane.

(b) Transport of gases by blood.

(d) Pulmonary ventilation by which atmospheric air is drawn in and $C O_{2}$ rich alveolar air is released out.

(e) Diffusion of $O_{2} a n d C O_{2}$ between blood and tissues.~

Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood to tissue.

P: Absorption of

C O_{2}

by the blood.

Q: Reaction of absorbed

C O_{2}

with

H_{2} O

to form

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

and

H C O_{3}^{-}

ions.

R: Reaction of absorbed

C O_{2}

with

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

and

H C O_{3}^{-}

ions.

S: Combination of

H^{+}

with heme portion of

H b O_{2}

to release

O_{2}

T: Combination of

H C O_{3}^{-}

with heme portion of

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

Q. Given below is a list of different steps (i-vi) involved in respiration.
(i) Utilisation of

O_{2}

by the cells for catabolic reactions
(ii) Transport of gases by the blood
(iii) Pulmonary ventilation by which atmospheric air is drawn in and

C O_{2}

is released out
(iv) Release of resultant

C O_{2}

(v) Diffusion of

O_{2}

and

C O_{2}

between blood and tissues
(vi) Diffusion of gases (

O_{2}

and

C O_{2}

) across alveolar tissues.
Select an option which has correct sequence of all the steps.

Q. Read the given statements and select the correct option.

Statement 1: About 70% of

C O_{2}

that enters RBCs changes into.

H C O_{3}

for transport in plasma to the lungs where it reconverts into

C O_{2}

for elimination.
Statement 2: About 40% of

C O_{2}

that enters RBCs changes into carbaminohaemoglobin which releases

O_{2}

in the lungs.

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During a breathing cycle, why do lungs always contain a residual volume of air in it?

The correct option is D It gives sufficient time for O2 absorption and CO2 release. During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.