Q.

Respiration involves the following steps.

I) Diffusion of gases O2 and CO2 across alveolar membrane
II) Transport of gases by blood
III) Cellular respiration 
IV) Pulmonary ventilation
V) Diffusion of O2 and CO2 between blood and tissues. 

The correct sequence of steps is

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a

III→II→ V→I→ IV

b

V→ IV→III→ II→I 

c

IV→ I→II→ V→III 

d

I→ II→III→ IV→V 

answer is C.

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Detailed Solution

The correct sequence of steps in respiration is:

  • IV) Pulmonary ventilation
  • I) Diffusion of gases O2 and CO2 across alveolar membrane
  • II) Transport of gases by blood
  • V) Diffusion of O2 and CO2 between blood and tissues. 
  • III) Cellular respiration 
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