With reference to the oxyhaemoglobin dissocia | vedclass

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(A) $I$. $100\%$ saturation of haemoglobin is very rare under physiological conditions because the partial pressure of oxygen in the blood rarely reac

Vedclass · Accepted Answer

$I$ and $IV$ only

Vedclass · Answer

(A) $I$. $100\%$ saturation of haemoglobin is very rare under physiological conditions because the partial pressure of oxygen in the blood rarely reaches levels that would cause complete saturation.$II$. In the alveoli,the $ppO_2$ is approximately $100 	ext{ mm Hg}$,which results in $95-97\%$ saturation of haemoglobin,which is a correct statement.$III$. At a $ppO_2$ of $30 	ext{ mm Hg}$,the saturation of haemoglobin is approximately $50\%$,which is a correct statement.$IV$. The oxyhaemoglobin dissociation curve is sigmoidal ($S$-shaped),not $J$-shaped.Therefore,statements $I$ and $IV$ are incorrect.

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