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Human Circulatory System

The diagrams ...

Question

The diagrams given below are cross-sections of blood vessels.

Name the parts labelled 1-3.

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Solution

1. - Tunica adventitia (External layer, connective tissue)

2. - Lumen
3. - Tunica media (Middle layer, Smooth muscle and elastic fibres)

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Human Circulatory System

Standard IX Biology

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