Question

The main difference in the structure of arteries and veins is in

• A. Tunica intima, made up of simple squamous epithelium
• B. Tunica media
• C. Tunica externa
• D. Tunica adventitia

Answer 1

Answer: (B)

Tunica media

Arteries and veins are the types of blood vessels that supply blood from part to the other in the body. They have different types of layers present in them.

• Tunica intima - It is the inner coat or layer of the arteries and veins. It is made up of only a single layer of squamous epithelial cells.
• Tunica media - It is located between the inner and outer layers of the arteries and veins. They are made up of smooth cells and are elastic in nature. They are thicker in arteries than in veins due to the development of pressure on the walls of arteries.
• Tunica externa - It is the outer cola or layer of the arteries and veins. It is comprised of collagen fibers and gives strength and support to the blood vessels.
• Tunica adventitia - It is the additional coat or layer present in between the middle and outer coat. It provides structural stability to the arteries and veins.

So, the correct option is 'Tunica media'.