Elastic fibres are absent in the walls of _.
Correct answer: C. Veins
- A. Aorta
- B. Arteries
- C. Veins
- D. Both options A and B
Explanation
The elastic fibres are essential in the recoil and the stretch of the blood vessel in order to survive high blood pressure. In veins, however, due to the lack of significant blood pressure, elastic fibres are not needed.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Blood Vessels
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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