Haemoglobin definitons

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Last updated 10:26 AM on 8/5/26
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4 Terms

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Affinity for oxygen definition

How readily oxygen binds to haemoglobin.

High affinity for oxygen means easy association, low affinity means difficult association and easier dissociation.

2
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Partial pressure definition (pO2)

The concentration of oxygen in the environment available for association.

There’s a high pO2 in the lungs and a low pO2 in tissues.

3
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Percentage saturation definition

The number of haemoglobin binding sites occupied by oxygen.

A Hb bound to 4 oxygens is fully saturated.

4
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Dissociation curve

Shows how saturated the haemoglobin is with oxygen at any given partial pressure.