| (i) Diffusion of gases, \[{{O}_{2}}\] and \[C{{O}_{2}}\] across the alveolar membrane. |
| (ii) Transport of gases by the blood. |
| (iii) Utilisation of \[{{O}_{2}}\] by the cells for catabolic reactions and the resultant releases of\[C{{O}_{2}}\]. |
| (iv) Pulmonary ventilation by which atmospheric air is drawn in and \[C{{O}_{2}}\] rich alveolar air is released out. |
| (v) Diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] between the blood and tissue. |
A) (iii), (v), (ii), (i), (iv)
B) (iii), (ii), (v), (i), (iv)
C) (v), (iv), (iii), (ii), (i)
D) (i), (ii), (iii), (iv), (v)
Correct Answer: A
Solution :
[a] Major steps involving respiration are Step 1: Utilisation of \[{{O}_{2}}\] by cell of catabolic reactions. Step 2: Diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] between blood and tissues. Step 3: Transportation by blood. Step 4: Diffusion of gases (\[{{O}_{2}}\]and\[C{{O}_{2}}\]) through alveolar membrane. Step 5: \[C{{O}_{2}}\] goes out and atmospheric air is drawn in.
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