text: They are found in veins which prevent backflow of the blood so that they will be causing unidirectional movement of the blood. So ನಮ್ಮ heart ಅಲ್ಲಿ ಬೇರೆ ಬೇರೆ ತರದ valves ಇದೆ. So we can group the valves into two types.