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Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation3 Marks
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.
Differences:
  • 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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