Discussion
Assertion (A) : Arteries have thick and elastic walls as compared to veins.
Reason (R) : The pressure of blood flow in arteries is low as compared to veins.
Answer: D
(A) is true and (R) is false.
Arteries carry blood away from the heart under high pressure, so they have thick, elastic walls to withstand it.
(R) has it the wrong way round: blood pressure is high in arteries and low in veins, which is why veins have thinner walls and valves to stop backflow.
The difference in wall thickness follows directly from this: thick, muscular, elastic arterial walls absorb each surge of blood pumped by the heart and keep it flowing between beats.
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