Tiny Blood Vessels Are Called?

Answer

The tiny blood vessels in our bodies are called coronary collaterals. They act effectively as a natural heart by-pass. Coronary collaterals are practically imperceptible until activated when they enlarge to carry major amounts of blood.
Q&A Related to "Tiny Blood Vessels Are Called?"
Capillaries.
http://wiki.answers.com/Q/What_are_tiny_blood_vess...
Size Capillaries are very small, thin and fragile. In some cases, they are only one cell thick, so only one cell can pass through them at a time. Connection to Arteries The arteries
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Capillaries are the bodies tiniest blood vessels.
http://www.chacha.com/question/what-are-tiny-blood...
The three layers of the arterial wall are, from outside to inside, the adventia, the media and the intima. A flat layer of cells, called endothelial cells, forms a boundary between
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