
Tubes which carry blood around the body. They come in three types, arteries, veins, and capillaries. Capillaries are always tiny, the others vary from large (centimeters in diameter) to quite small (slightly smaller than the diameter of a red blood cell).
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http://en.wikipedia.org/wiki/Glossary_of_diabetes

tubes that carry blood to and from all parts of the body. The three main types of blood vessels are arteries, veins, and capillaries.
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http://www.diabetes.co.uk/glossary/b.html

tubes that carry blood to and from all parts of the body. The three main types of blood vessels are arteries, veins and
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http://www.diabetes.org

Tubes that carry blood around the body.
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http://www.encyclo.co.uk/local/20560

Any of the tubular vessels conveying the blood (arteries, arterioles, capillaries, venules, and veins). ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

Tubes that carry blood to and from all parts of the body. The three main types of blood vessels are arteries, veins and capillaries.
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All the vessels lined with endothelium through which blood circulates.
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Tubes that carry blood to and from all parts of the body. The three main types of blood vessels are arteries, veins and capillaries.
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http://www.shieldhealthcare.com/community/diabetes/2011/06/30/diabetes-glos

Arteries, arterioles, veins, venules, capillaries: the conduits for the transport of blood throughout the body.
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http://www.thehorse.com/Glossary.xhtml?L=B

Tubes which carry blood around the body. They come in three types, arteries, veins, and capillaries. Capillaries are always tiny, the others vary from large to quite small.
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http://www.translationdirectory.com/glossaries/glossary099.htm

veins, arteries and capillaries which carry blood through the body
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https://sciencetrek.org/sciencetrek/topics/blood/glossary.cfm

deliver blood to the eye through the optic nerve
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https://sciencetrek.org/sciencetrek/topics/eyes/glossary.cfm

arteries, arterioles, capillaries, venules and veins carrying blood to and from the skin.
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https://www.dermnetnz.org/topics/terminology

Tubes that carry blood to and from all parts of the body. The three main types of blood vessels are arteries, veins, and capillaries.
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https://www.diabetes.org/resources/students/common-terms

(artery, arteries, blood vessel, capillary, capillaries, vein(s) Tubes which carry blood around the body: arteries which carry blood containing oxygen; veins which carry blood back to the heart to pick up more oxygen and capillaries, the smallest blood vessels, which connect arteries to veins.
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https://www.encyclo.co.uk/local/20753

The tubes that take blood around the body.
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https://www.encyclo.co.uk/local/21200

tubes (arteries and veins) that carry blood to and from the eye.
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https://www.stanfordchildrens.org/en/topic/default?id=pediatric-glossary---
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