Question
Describe the basic structure of an artery. How does it differ from that of a vein?
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Answer
Structure of an artery:
- An artery consists of a three-layered wall enclosing a narrow lumen.
- Tunica externa is the outermost or external layer that is made of fibrous connective tissue with collagen fibres.
- Tunica media is the middle layer composed of smooth muscles and elastic fibres.
- Tunica interna is the innermost layer, made of squamous endothelium.
- The tunica media is thicker in arteries than in vein.
- The lumen is narrow in the artery and is broader in the vein.
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