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BookmarkIn biology, a vein is a blood vessel which carries blood toward the heart.
See also:
Veins form part of the circulatory system.
The vessels that carry blood away from the heart are known as arteries.
Veins have one-way valves to prevent backflow caused by gravity..
For more information about the topic Vein, read the full article at Wikipedia.org, or see the following related articles:
Circulatory system — A circulatory system (sometimes cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body ... > read more
Lymphatic system — Lymph originates as blood plasma lost from the circulatory system, which leaks out into the surrounding tissues. The lymphatic system collects this ... > read more
Varicose veins — Varicose veins are veins on the leg which are large, twisted, and ropelike, and can cause pain, swelling, or itching. They are an extreme form of ... > read more
Heart valve — In anatomy, the heart valves are valves in the heart that maintain the unidirectional flow of blood by opening and closing depending on the ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Vein at Wikipedia.org. See the Wikipedia copyright page for more details.
