Circulation
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Circulation (Medicine)
Circulation (pronunciation: /sɜːr.kjʊˈleɪ.ʃən/) refers to the movement of blood through the heart and blood vessels, which is driven by the pumping action of the heart.
Etymology
The term "circulation" is derived from the Latin word "circulatio", which means "a going around". In the medical context, it was first used in the 1620s to describe the circular movement of blood in the body.
Related Terms
- Cardiovascular System: The organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones, and blood cells to and from the cells in the body to provide nourishment and help in fighting diseases.
- Heart: The organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
- Blood Vessels: The part of the circulatory system that transports blood throughout the body. There are three major types of blood vessels: the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the capillaries back toward the heart.
- Blood: The body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells.
- Pulmonary Circulation: The portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart.
- Systemic Circulation: The part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.
See Also
External links
- Medical encyclopedia article on Circulation
- Wikipedia's article - Circulation
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