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Question: Answered & Verified by Expert
A vein possesses a large lumen because
BiologyBody Fluids and CirculationNEET
Options:
  • A Tunica media and tunica externa form a single coat
  • B Tunica interna and tunica media form a single coat
  • C Tunica interna, tunica media and tunica externa are thin
  • D Tunica media is a thin coat
Solution:
1428 Upvotes Verified Answer
The correct answer is: Tunica media is a thin coat
Basically each artery and vein consists of three layers: an inner lining of squamous endothelium (the tunica interna), a middle layer of smooth muscle and elastic fibre (the tunica media), and an external layer of fibrous connective tissue with collagen fibres (the tunica externa).

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