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Oxygen-binding curve for myoglobin

Oxygen-binding curve for myoglobin
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Description: The free oxygen concentration is expressed as PO2, the partial pressure of oxygen.

The proportion of myoglobin binding sites that are occupied is expressed as a fraction (YO2, on the left) or as percent saturation (on the right).

As PO2 becomes large, 100% saturation is approached asymptotically.

The value of P50, the partial pressure of oxygen at 50% saturation, is indicated on the graph (black arrow). The dashed blue lines show that at PO2, of 30 mm Hg, Mb would be 90% saturated with O2.

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