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No. They prevent back flow as the blood pressure is much lower on the venous side. The blood has to get to the heart so it can be pumped to the lungs.
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∙ 10y ago
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Which vein in the human body does not contain valves?
all veins contain valves
What causes imcompetent valves in leg veins?
Venous insufficiency is a condition in which blood pools in the vein because the valves have become incompetent.
Which veins don't have valves?
The facial vein has no valveshttp://en.wikipedia.org/wiki/Facial_vein
What are flaps of tissue that allow blood to flow in only one direction?
They are called valves, or leaflet valves in the veins, that interlock to prevent backflow of the blood.
When valves of veins do not function properlythey are referred to as competent valves?
They would be considered incompetent valves because they are not working properly. You need all the vein valves to work properly for maximum functioning.
What is a varicose vein in hunman body?
A varicose vein is a distended vein where the valves are unable to close properly. This can lead to thromboses, which are blood clots and can make the veins hard, bumpy, and painful.
What do veins have to prevent blood from flowing backward?
One-way valves prevent the back flow of bloodThere are tiny one way valves throughout a vein. These stop blood from flowing backwards. Interestingly, when these valves in veins in the legs malfunction, the result are varicose veins.
What causes abnormally swollen veins in legs?
They are called varicose veins and they are a result of faulty valves in the veins that allow blood to pool or flow back instead of going forward and the vein then bulges.
What is the symptom of a person whose vein valves are not functioning properly and are causing fluid to flow away from the heart?
Swollen veins
What is the term for a thin-walled blood vessel with valves that carries blood to the heart?
Veins are thin-walled blood vessels that carry blood to the heart. The valves in veins help prevent backflow. In contrast, arteries have thicker walls and no valves. They carry blood away from the heart.
Why does the blood not flow backwaed in the our vein?
There are a number of structures that help with the one way flow of blood through the veins. These include valves in the vein lumen, and the assistance of surrounding skeletal muscle.
What is a superficial vein in the leg?
The superficial veins of the legs connect to the deep veins through "penetrating veins" which run perpendicular to the skin from one to the other. The deep veins are essentially a column of blood running from your head to you feet and so when one is standing are under high pressure. In order to keep this pressure away from the frail superficial veins the penetrating veins have valves. When one of these valves goes bad the high pressure is allowed to go back to the superficial veins which blow up like balloons and become visible as what we call varicose veins (or "spider veins").
