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What prevents backflow into the atria when ventricles are contracting?

Answer

the valves between the atria and ventricles stop blood from going backwards
Q&A Related to "What prevents backflow into the atria when ventricles..."
The Atrioventricular (AV) valves
http://www.chacha.com/question/what-valves-prevent...
The atrioventricular (AV) valves separate the atria and the ventricles. The right sided AV valve is the tricuspid valve and the left sided AV valve is the bicuspid or mitral valve
http://answers.yahoo.com/question/index?qid=201005...
I answered this question a few minutes ago in the biology section, but here it is again: Yes..the pressure in the atria increases as they contract to push the blood into the ventricles
http://uk.answers.yahoo.com/question/index?qid=201...
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