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______ are structures that allow for one-way blood flow through the heart.
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______ are structures that allow for one-way blood flow through the heart.

User Amranur Rahman
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The answer is valves. Valves exist all throughout the cardiovascular system, but are especially important in the heart. 
User Hammad Nasir
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Valves are structures that allow for one-way blood flow through the heart.
User Santosh Tiwary
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