Question

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.

• A. (iii), (vi), (ii), (v), (i), (iv)
• B. (iii), (vi), (i), (v), (ii), (iv)
• C. (iv), (ii), (v), (iii), (i), (vi)
• D. (iv), (vi), (ii), (v), (i), (iii)

Answer 1

The correct option is A (iii), (vi), (ii), (v), (i), (iv)

During respiration atmospheric air is drawn in and carbon dioxide is released , diffusion of gases takes place in the alveolar tissue which is then carried by blood, then diffusion of gases take place between blood and tissues, oxygen is utilized by cells for catabolic reactions, and the resultant carbon dioxide is released from the body.

So, the correct option is '(iii), (vi), (ii), (v), (i), (iv)'.