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Respiration

Which of the ...

Question

Which of the following pairs of reactions occurs most frequently in the blood surrounding the structure shown?

H b + O_{2} \to H b O_{2}

and

H H b \to H b

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H b O_{2} \to H b + O_{2}

and

H b + H^{+} \to H H b

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H^{+} + H B \to H H b

and

H_{2} C O_{3} \to H C O_{3} + H^{+}

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C O_{2} + H_{2} O \to H_{2} C O_{3}

and

H_{2} C O_{3} \to H C O_{3} + H^{+}

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Solution

The correct option is A $H b + O_{2} \to H b O_{2}$ and $H H b \to H b$
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.

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