Give scientific reason.
Arteries are thicker than veins.
i. Arteries carry oxygenated blood away from the heart to the body.
ii. The blood pumped out by the heart is under high pressure and to withstand this pressure arteries are thick-walled.
iii. Veins carry deoxygenated blood from the body back to the heart.
iv. They are thin-walled as the blood that flows through veins is under low pressure. Hence, arteries are thicker than veins.