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ShareIn 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 more
Lung — The lung is the essential organ of respiration in air-breathing vertebrates. Its principal function is to transport oxygen from the atmosphere into ... > read more
Blood vessel — The blood vessels are part of the circulatory system and function to transport blood throughout the body. The most important types, arteries and ... > read more
Blood pressure — Blood pressure is the pressure exerted by the blood on the walls of the blood vessels. Unless indicated otherwise, blood pressure is understood to ... > read more
Mitral valve — The mitral valve, also known as the bicuspid valve, is a valve in the heart that lies between the left atrium (LA) and the left ventricle ... > read more
Note: 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.
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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