Question

why endothelium cells are more flat in artery than vein​

Answer 1

Answer:

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Endothelial cells, which form the inner cellular lining of blood vessels and ... Indeed, capillaries are essentially 3D tubes of flat ECs surrounded to a variable ... Veins travel with arteries more than the surface of the heart.

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Answer 2

Endothelium is a single layer of squamous endothelial cells that line the interior surface of blood vessels, and lymphatic vessels.