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Question

Which of the following pairs of reactions occurs most frequently in the blood surrounding the structure shown?
170728_d8cd44a47965424783c6c1d9e618d7ab.png


A
Hb+O2HbO2 and HHbHb
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B
HbO2Hb+O2 and Hb+H+HHb
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C
H++HBHHb and H2CO3HCO3+H+
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D
CO2+H2OH2CO3 and H2CO3HCO3+H+
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Solution

The correct option is A $${Hb+O_2\rightarrow HbO_2 }$$ and $${HHb \rightarrow Hb}$$
The given structure is of alveolar tissue. External respiration takes place in the lungs. External respiration is the exchange of gases between the alveoli of the lungs and the blood. In this, external air is taken into the body in order to supply the lungs with oxygen and carbon dioxide is expelled out from the body. The chemical reaction of external respiration is
Hb + O$$_2$$ → HbO$$_2$$
HHb → H$$^+$$ + Hb
HbCO$$_2$$ → Hb + CO$$_2$$
Thus, the correct answer is option A.

Biology

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