The diagram illustrates how three different concentrations of carbon dioxide affect the dissociation curve of human haemoglobin. X = partial pressure of carbon dioxide: $3.0\,\text{kPa}$, Y = partial pressure of carbon dioxide: $5.0\,\text{kPa}$, Z = partial pressure of carbon dioxide: $7.0\,\text{kPa}$. What effect does carbon dioxide have on haemoglobin?
- Ait makes it less efficient at taking up oxygen and also less efficient at releasing it
- Bit makes it less efficient at taking up oxygen and more efficient at releasing it
- Cit makes it more efficient at taking up oxygen and also more efficient at releasing it
- Dit makes it more efficient at taking up oxygen and less efficient at releasing it