How Valves Prevent Blood Flow Reversal: Veins & Heart Explained

Valves in the veins and heart ensure that the blood does not flow backward. Valves are one-way flaps of connective tissue and muscle placed at regular intervals in the veins. They allow blood to flow towards the heart but prevent backward flow. Similarly, the heart has four valves that control the flow of blood in and out of the heart's chambers, ensuring a one-way flow of blood.