The diagram shows the outside of the mammalian heart together with the blood vessels linked to it. Which statement about the blood vessels linked to a normal, healthy heart is correct?
- AP and Q carry blood with more oxyhaemoglobin than haemoglobin.
- BP and R carry blood that is saturated with oxygen.
- CS and P carry blood with a low oxygen concentration.
- DS and R carry blood with more haemoglobin than oxyhaemoglobin.