Question

Which of the following help veins to prevent the backflow of blood?

• A. The pressure excreted by the heart pushes the blood back
• B. The valve in the veins prevent back flow
• C. The suction in the heart pulls up the blood
• D. None of the above

Answer 1

The correct option is B

The valve in the veins prevent back flow

Veins collect blood from different parts of the body and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, but instead, they have valves to ensure that the blood flows only in one direction towards the heart.