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Byju's Answer
Standard VII
Biology
Blood Vessels
The diagrams ...
Question
The diagrams given below show the cross section of two kinds of blood vessels:
(b) Name the parts numbered 1 and 2.
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Solution
The parts labelled as 1 and 2 are endothelium and lumen.
Endothelium is the inner layer of blood vessels.
Lumen is the inside space through which blood flows.
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