What are the four valves?
left and right atriums
left and right ventricles
No. Trombones, bugles and natural horns have no valves, piccolo trumpets can have four, horns can have three, four, five or six, but four is most common (std double horn). Tubas and baritones also frequently have four valves, and some tubas have five. There are also keyed trumpets that have keys like a woodwind instead of valves, but they are archaic.
There are four valves of the heart: two are located between the atria and ventricles of the heart (called atrioventricular valves) and two are located in the major vessels leaving the valves (called semilunar valves). The left atrioventricular valve is also known as the bicuspid valve or the mitral valve. The right atrioventricular valve is also known as the tricuspid valve. The two semilunar valves are named after the vessel they lie within: the left…
The normal human heart has four valves. Valves, when working properly, allow blood to flow in one direction only to the different chambers of the heart. There four valves are called the mitral valve, the tricuspid valve, the aortic and pulmonary valves. Each valve works for a specific chamber of the heart. Occasionally a congenital defect or other problem can cause the valves in the heart to stop working efficiently. In this event surgery can…
The heart has four chambers and each chamber has valves. The valves help to direct the flow of blood in one direction only. So when the heart pumps the valves open to propel the blood. During relaxation the valves close so that the chamber can fill with more blood so that it can pump out on the next contraction.
Depending on which engine you have and if the engine is a dohc engine four cylinder engines have two valves per cylinder totaling eight, unless it is a dohc then it has four valves per cylinder then it would have sixteen, the same holds true for the six cylinder engines with single cam engines having twelve and duel overhead cam engines having twenty four