Dissolved oxygen is not dependent on :-
A. HbB. Atmospheric pressure
C. Alveolar pressure
D. Arterial tension of O2
Ans. A)
Hb. In the normal range of alveolar PO2 i.e. below 120 mm Hg almost none of the
total oxygen is accounted for by dissolved oxygen. As the pressure rises to
thousands of millimeters of mercury, a large portion of the total oxygen is the
dissolved portion in the water of the blood. Hb is an option which is
saturable, i.e. as far as the dissolved O2 in blood is concerned and any
changes in hemoglobin do not affect its concentration after being saturated.
But the other three options affect the concentration of dissolved O2 to a
greater extent independent of the hemoglobin concentration.
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