Question

Which among the three layers of blood vessel wall-Tunica intima, Tunica media and Tunica Externa is comparatively thin in the veins?

• A. Tunica externa
• B. Both tunica media and tunica externa
• C. Tunica media
• D. Tunica intima

Hint:

Veins have a thin Tunica media due to lower blood pressure.

Answer 1

The Correct Option is C

• Blood Vessel Structure: Veins have three layers: Tunica intima (inner endothelium), Tunica media (middle smooth muscle), and Tunica externa (outer connective tissue).
• Vein Characteristics: Veins have thinner walls and less muscle compared to arteries due to lower pressure. The Tunica media, which contains smooth muscle for vessel constriction, is significantly thinner in veins than in arteries.
• Option Analysis:
  • (1) Tunica externa: Thicker in veins to support low pressure, not thin. Incorrect.
  • (2) Both tunica media and tunica externa: Tunica externa is thicker, not thin. Incorrect.
  • (3) Tunica media: Comparatively thin in veins due to reduced muscle layer. Correct.
  • (4) Tunica intima: Similar thickness in veins and arteries, not the primary difference. Incorrect.
• Conclusion: The correct answer is (3) Tunica media, as it is thinner in veins compared to arteries.