Select the correct option regarding the following two statements labelled Assertion (A) and Reason (R). Assertion (A): The walls of veins are thinner than those of arteries. Reason (R): Veins carry blood under high pressure.
A is true, but R is false
Veins do have thinner walls than arteries because they carry blood at low pressure, on its way back to the heart. Arteries carry blood pumped out by the heart at high pressure, so their walls are thick, muscular and elastic to withstand it. Assertion (A) is therefore true.
The Reason (R) claims veins carry blood under high pressure, which is factually wrong — venous blood flows at low pressure and is helped along by valves and skeletal muscle contraction. So R is false. This matches the option where A is true but R is false.
Hence, the answer is A is true, but R is false.
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