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(D) In the lungs,the partial pressure of oxygen $(pO_2)$ is high,and the partial pressure of carbon dioxide $(pCO_2)$ is low,which favors the formatio

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$(1)$ is lungs and $(2)$ is tissues

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(D) In the lungs,the partial pressure of oxygen $(pO_2)$ is high,and the partial pressure of carbon dioxide $(pCO_2)$ is low,which favors the formation of oxyhaemoglobin $(HbO_2)$. Thus,the forward reaction occurs in the lungs.In the tissues,the partial pressure of oxygen $(pO_2)$ is low,and the partial pressure of carbon dioxide $(pCO_2)$ is high,which favors the dissociation of oxyhaemoglobin into haemoglobin $(Hb)$ and oxygen $(O_2)$. Thus,the backward reaction occurs in the tissues.

Select $(1)$ and $(2)$ from the given options for the reaction: $Hb + O_2 \rightleftharpoons HbO_2$

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