a flap of tissue that prevants blood from flowing backward is
Venous valves .
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capillaies
valve
The valve
In the heart/arteries, the Aortic valve prevents blood from flowing backwards. In the systemic veins, eustachean valves prevent the backwards flow of blood.
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The bicuspid valve is the valve that separates the left ventricle from the aorta.
your skin of course!
Heart valve.
valves in the veins
heart valves
the valves
valve
Venous valves .
Venous valves .
valve
Valves. Mitral and aortic.
Venous valves .
Blood is a constant whereabout in our bodies. As of such a frequent heartbeat exists within our system. Which causes the blood within our bodies to flow forward, in lamense terms it produces a very large push for the blood to distribute it's nutrients throughout the body and back within our heart and out again. This constant push is what prevents blood from flowing backwards in your veins.