The blood leaving the lungs has all its haemo | vedclass

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(B) The exchange of gases occurs due to the partial pressure gradient of $O_2$ and $CO_2$. In the lungs,the partial pressure of oxygen $(pO_2)$ is hig

Vedclass · Accepted Answer

$O_2$ concentration is lower in tissues than in the lungs.

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(B) The exchange of gases occurs due to the partial pressure gradient of $O_2$ and $CO_2$. In the lungs,the partial pressure of oxygen $(pO_2)$ is high,which promotes the binding of $O_2$ with haemoglobin to form oxyhaemoglobin. As blood reaches the tissues,the $pO_2$ is significantly lower compared to the blood because the tissues continuously consume $O_2$ for cellular respiration. Due to this lower $pO_2$ in the tissues,the affinity of haemoglobin for $O_2$ decreases,causing the oxyhaemoglobin to dissociate and release $O_2$ into the tissues.

The blood leaving the lungs has all its haemoglobin oxygenated. Why does it give up oxygen to the tissues?

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