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Q.

Arrange the following steps of respiration in sequence:

A. O2 and CO2 diffusion between blood and tissues

B. O2 use by cells and release of CO2

C. Gaseous transport with the help of blood 

D. Gaseous diffusion across alveolar tissue 

E. Entry of atmospheric air during pulmonary ventilation

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a

E → A → B → C → D 

b

A → B → C → D → E

c

E → D → C → A → B

d

C → D → A → B → E 

answer is C.

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Detailed Solution

Respiration involves the following steps: 

(i) Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out. 

(ii) Diffusion of gases (O2 and CO2 ) across alveolar membrane.

(iii) Transport of gases by the blood. 

(iv) Diffusion of O2 and CO2 between blood and tissues. 

(v) Utilisation of O2 by the cells for catabolic reactions and resultant release of CO2.

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