State which part of the haemoglobin molecule is labelled X.
State the purpose of the structure labelled X.
Haemoglobin is described as having quaternary structure. State what is meant by quaternary structure.
The $p\text{CO}_2$ of alveolar air is $5.3\,\text{kPa}$. With reference to Fig. 6.2, state the likely partial pressure of oxygen in the alveoli of the mammal.
Suggest the range of partial pressures of oxygen in respiring tissues and use Fig. 6.2 as evidence for your response.
The $pCO_2$ of alveolar air is $5.3\,\text{kPa}$. With reference to Fig. 6.2, state the likely partial pressure of oxygen in the alveoli of the mammal.
Suggest the range of partial pressures of oxygen in respiring tissues **and** use Fig. 6.2 as evidence for your answer.
Use the information in Fig. 6.2 to describe the effect of increasing $pCO_2$ on the percentage saturation of haemoglobin with oxygen.
State the name given to the effect you have described in part (iii).
Explain the advantage to the mammal of the effect you described in part (iii).