The graph shows a dissociation curve for haemoglobin. Which axis labels would be appropriate for the x-axis and y-axis?
- Ax-axis: partial pressure of carbon dioxide; y-axis: percentage of haemoglobin
- Bx-axis: partial pressure of oxygen; y-axis: percentage saturation of haemoglobin with oxygen
- Cx-axis: percentage of haemoglobin; y-axis: partial pressure of oxygen
- Dx-axis: percentage saturation of haemoglobin with oxygen; y-axis: partial pressure of carbon dioxide