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What are collateral blood vessels in the heart?

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There's a network of tiny blood vessels in the heart that usually aren't open. They're the collateral vessels.

From: How the Heart Works WebMD Medical Reference

SOURCE:

American Heart Association. 

Reviewed by James Beckerman on April 15, 2018

SOURCE:

American Heart Association. 

Reviewed by James Beckerman on April 15, 2018

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