The graph presents the oxygen dissociation curves for adult haemoglobin at two carbon dioxide concentrations. Which letters indicate measurements taken in the capillaries of the lungs and in the capillaries of active muscle?
- Alungs: P, active muscle: R
- Blungs: P, active muscle: S
- Clungs: Q, active muscle: R
- Dlungs: Q, active muscle: S