Fig.1 compares the structure of two main human blood vessels.
Fig.1
Identify blood vessel A.
[1]
State a reason for your answer in part (i).
[1]
Blood vessel B has a very large lumen.
Identify blood vessel B.
[1]
Explain the presence of the lumen in blood vessel B.
[2]
The flow of blood in veins is not assisted by the pressure generated by the beating of the heart.
List two structures that assist with the flow of blood in veins.
The diagram represents a mammalian circulatory system. Mammals have two separate circulations that supply blood to different organs.
State the name of the circulation that blood vessels T and S form part of.
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