| I. Absorption of \[C{{O}_{2}}\]by the blood. |
| II. 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 \[HCO_{3}^{-}\]ions. |
| III. 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 \[HCO_{3}^{-}\]ions. |
| IV. Combination of \[{{H}^{+}}\] with haeme portion of \[Hb{{O}_{2}}\]to release\[{{O}_{2}}.\] |
| V. Combination of \[HCO_{3}^{-}\]with haeme portion of \[Hb{{O}_{2}}\]to form reduced haemoglobin and release of \[{{O}_{2}}.\] |
A) I, II and V
B) I, III and IV
C) I, II and IV
D) I, III and V
Correct Answer: C
Solution :
During the delivery of oxygen from blood to tissue the right sequential phenomenon will be as follows [a] Absorption of \[C{{O}_{2}}\]by the blood. [b] Reaction of absorbed \[C{{O}_{2}}\]with \[{{H}_{2}}O\]to form \[{{H}_{2}}C{{O}_{3}}\]within RBCs and its conversion into \[{{H}^{+}}\]and \[HCO_{3}^{-}\]ions. [c] Combination of \[{{H}^{+}}\]with haeme portion of \[Hb{{O}_{2}}\]to release oxygen \[({{O}_{2}}).\]
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