- as we've just discussed, H+ ions are released from erythrocytes when they dissociate from carbonic acid. These H+ ions are then taken up by Hb molecules, where they have to compete for space.
- But when CO2 is present in the erythrocyte the H+ ions displace the oxygen in the haemoglobin.
- so, the oxyhaemoglobin releases MORE oxygen to the tissue.
The Bohr effect states that: At any particular oxygen tension, the oxyhaemoglobin releases more oxygen when carbondioxide is present.
- so,when CO2 is present, Hb is less saturated with O2. So the O2 dissociation curve shifts downwards and to the right. (the Bohr shift)
- the Bohr effect results in O2 being more readily released where more CO2 is produced from respirtion. this is coincidently exactly what muscles need to continue aerobically respiring!!!
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