Which of the following blood vessels contain venous valves?

• A. Arteries
• B. Capillaries
• C. Veins
• D. Arterioles

Answer: (C)

Verified step by step guidance

1. Understand the function of venous valves: Venous valves are structures within veins that prevent the backflow of blood, ensuring it moves in one direction towards the heart.
2. Differentiate between the types of blood vessels: Arteries carry blood away from the heart, veins carry blood towards the heart, capillaries are small vessels where gas exchange occurs, and arterioles are small branches of arteries.
3. Recognize that veins are the only blood vessels that contain valves. This is because veins work against gravity, especially in the limbs, and need valves to prevent backflow.
4. Consider the structure of veins: Veins have thinner walls compared to arteries and are equipped with valves to help maintain unidirectional blood flow.
5. Conclude that veins are the correct answer as they are the only type of blood vessel listed that contain venous valves.