Question

Identify the wrong statement.

• A. All the veins carry deoxygenated blood
• B. Veins usually collapse when they are empty
• C. The wall of arteries is thicker than veins
• D. The lumen is smaller in the arteries

Answer 1

The correct option is A All the veins carry deoxygenated blood

Arteries, veins and capillaries are the three types of blood vessels.
Capillaries are blood vessels which join the arteries with the veins. The exchange between blood and organ cells takes place in the capillaries.
Arteries generally supply oxygenated blood from the heart to the other body parts and veins generally carry the deoxygenated blood from the organs to the heart.

But pulmonary arteries and pulmonary veins are the exceptions. The pulmonary artery carries deoxygenated blood from the heart to the lungs. After the gaseous exchange in the lungs, the blood gets oxygenated and is carried to the heart through pulmonary veins. So all veins except pulmonary veins carry deoxygenated blood.

The lumen in the veins are generally broader than the arteries.
The tunica media (middle layer of the walls of arteries and veins) is thick, having more muscle fibres in the arteries than the veins. So the wall of arteries is thicker than veins.

The thick and tough wall makes the arteries non-collapsible when they are even empty. On the other hand, veins have thinner walls than the arteries due to which they can collapse when they are empty.