EVERYDAY SCIENCE

Detailed explanation-1: -Arteries have thick walls because they need to withstand high pressure generated by the heart. Veins have thin walls because they do not need to withstand as much pressure. Arteries are also narrower than veins, which allows for faster blood flow.

Detailed explanation-2: -Arteries experience a pressure wave as blood is pumped from the heart. This can be felt as a “pulse.” Because of this pressure the walls of arteries are much thicker than those of veins.

Detailed explanation-3: -The walls of veins have the same three layers as the arteries. Although all the layers are present, there is less smooth muscle and connective tissue. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has less pressure than in the arteries.

Detailed explanation-4: -Veins collect the blood from different organs and bring it back to the heart. The blood is no longer under pressure, so the walls are thin with valves to ensure that blood flows only in one direction.