Valves
Valves
Valves (/vælvz/) are devices or natural objects that regulate, direct or control the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. In the medical field, valves are often referred to in the context of the human body, where they serve a critical function in various systems, most notably the cardiovascular system and the digestive system.
Etymology
The word "valve" comes from the Latin valva, which means "a part of a door that moves".
Types of Valves in the Human Body
There are several types of valves in the human body, including:
- Heart Valves: These are critical components of the cardiovascular system, controlling the flow of blood in and out of the heart. There are four heart valves: the mitral valve, the tricuspid valve, the pulmonary valve, and the aortic valve.
- Venous Valves: These are found in the veins of the legs and prevent the backflow of blood.
- Pyloric Valve: This is located at the lower part of the stomach and controls the passage of food into the small intestine.
Related Terms
- Valvular Heart Disease: This is a condition characterized by damage to or a defect in one of the four heart valves.
- Valvuloplasty: This is a procedure used to repair a stenotic (narrowed) heart valve.
- Valvotomy: This is a surgical procedure that involves cutting into or through a valve.
External links
- Medical encyclopedia article on Valves
- Wikipedia's article - Valves
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