SCIENCE
CIRCULATORY SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
have a pleated endothelium.
|
|
|
have thinner walls.
|
|
|
have more smooth muscle in their tunica media.
|
|
|
hold their shape better when cut.
|
Detailed explanation-1: -Blood flow through vein does not exert pressure on the walls of veins. Due to this, they do not need thick walls. Hence, veins have thin walls as compared to arteries.
Detailed explanation-2: -It is because arteries carry blood from the heart. They can withstand pressure because of their thick walls. Veins have thin walls due to the low pressure.
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: -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.
Detailed explanation-5: -Since the blood pumped from the heart into the arteries flows at higher pressure than the blood in veins, hence arteries need to have thicker walls or else the high blood pressure might cause them to burst.