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Just simply mentioning the structure:

Arteries

High blood pressure (not sure if that counts as structure)

Thick outer wall

Thick layer of elastic-muscle fibre

Narrow central tube (lumen)

Smooth lining so no obstruction of blood flow

Veins

Low blood pressureThin outer wallThin layer of inelastic muscleWide central tube (lumen)Have flaps of valves

Capillaries

One cell thick wall

Highly branched networks

Pores in the walls between cells

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11y ago

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Q: What is the structure of the veins capillaries and artery?
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