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A vein possesses a large lumen because

1. tunica media and tunica externa form a single coat.
2. tunica interna and tunica media form a single coat.
3. tunica interna, tunica media and tunica externa are thin.
4. tunica media is a thin coat.

Correct answer: tunica interna, tunica media and tunica externa are thin.

Solution

Veins carry blood at low pressure, so they do not need a thick muscular wall. Their tunica media is especially thin, and the other layers are also relatively thin, allowing a larger lumen to remain open.

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