The diagram is an external view of the mammalian heart and the associated blood vessels.
Which statement about the blood vessels associated with a normal, healthy heart is correct?
1 )
P and Q carry blood with more oxyhaemoglobin than haemoglobin.
P and R carry blood that is saturated with oxygen.
3 )
S and P carry blood with a low oxygen concentration.
4 )
S and R carry blood with more haemoglobin than oxyhaemoglobin.
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