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Mortality, Natality and Dispersal

If the CO 2 l...

Question

If the $C O_{2}$ level increases in the blood, it favours ______

A

Loading of O₂ in the blood

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B

Decreased availability of O₂ in tissues

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C

Unloading of O₂ from the blood

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D

Both A and B.

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Solution

The correct option is C
Unloading of O₂ from the blood

As the $p C O_{2}$ in the blood increases, the affinity of oxygen for Hb is reduced. This can be seen in the shift of the $O_{2}$ - Hb dissociation curve to the right (Bohr shift). The chief consequence of the shift is that the $p O_{2}$ needed to produce any given saturation of Hb must be greater in the presence of increased $C O_{2}$ . In addition, in rapidly metabolizing tissues, there will be an increased unloading of oxygen.

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