in the arterial system, your heart keeps pushing everything forward.
in the venous system, you have valves everywhere to reduce backflow
Your heart keeps your blood "flowing"
The heart valves keep blood from flowing backward. This increases the efficiency of the pumping of the heart.
i think you mean bypass
a flap of tissue that prevants blood from flowing backward is
valves in the veins
your skin of course!
heart valves
These are called valves.
Valves in the veins prevent the blood from flowing backward or from pooling.
a valve
The four heart valves.
The flap of tissue that prevents blood from flowing backward is called a valve. Valves are found in veins and in the heart to ensure that blood flows in one direction and does not pool or backflow.