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 pAO2 and paO2  

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Hi everybody,
I'm having problems understanding how alveolar pressure of oxygen corresponds to levels of oxygen in arterial blood.
As far as I understand if partial pressure of oxygen in alveoli is around 100mmHg and hemoglobin is 15 g/dl,we can expect around 200ml of oxygen in arterial blood. 98 per cent of it carried by erythrocytes, rest dissolved.
However,if the pAO2 is increased to let's say 40 per cent, or if the person is breathing 100 per cent oxygen, O2 levels in blood should increase too due to increased portion of dissolved oxygen. Literature i've seen so far does not properly address this point,so if anybody knows i'd be eternally grateful.

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