Question

Why do veins have valves?

• A. To trap pathogens.
• B. To provide a substrate for clot formation.
• C. To prevent the backflow of blood.
• D. To increase the blood pressure.

Answer 1

The correct option is C

To prevent the backflow of blood.

The vein is a blood vessel that receives blood from an organ towards the heart. It has thin muscular walls with valves. The valves stop blood from flowing backward.