It actually looks more like a triangle.
I would assume you mean the tricuspid valve in the heart? Most other blood vessel valves are described as "semi-lunar", meaning they look like a half-moon, have two parts and when they close they completely block the vessel they're in. The tricuspid valve in the heart is composed of three pieces, so they would not be shaped like a half-moon.
Because there are crescent shaped, like half moons :)
The Right atrioventricular valve (also known as the Tricuspid Valve) has 3 FLAPS
The term septum is not a valve but a wall somewhat like a bedroom wall.
1. right atrium 2. right ventricle 3. left atrium 4. left ventricle These listed above are the four chambers of the heart. In between each chamber and the ventricles and large vessels leaving the heart, there are valves that allow the flow of blood in one direction but upon closing do not allow back flow (if they are working correctly). Between the right atrium leading into the right ventricle is an atrioventricular valve called the Tricuspidvalve. It is named for the three flaps from which it is made. Between the right ventricle and the pulmonary veins is a semilunar valve called the Pulmonary valve. Coming in between the left atrium and the left ventricle is an atrioventricular valve known as the Mitral valve (the shape is similar to the mitres worn by bishops) then in between the left ventricle and the aorta is a semilunar valve called the Aortic valve.SIMPLE ANSWER: The four valves of the heart can be grouped into two pairs. There is the Mitral Valve and Tricuspid Valve which control the blood flow from the atria to the ventricles, and there is the Aortic Valve and the Pulmonary Valve which control blood flow out of the ventricles.
The Bicuspid Valve is much like the Tricuspid Valve. It allows blood to flow through into the ventricle, but prevents blood from entering back into the atrium. The difference is it only has two flaps instead of three.
It flows through the atrioventricular (AV) valves. The right AV valve is the tricuspid valve, and the left AV valve is the bicuspid or mitral valve.
half of a clock
it is a piece of pizza or half a piece of toast. It is shaped like that because i cut it that way. ChaCha Again!
Between the Atria and Ventricles of the heart are the aptly named Atrioventricular valves. The valve between the right atrium and ventricle is called the Tricuspid because id has three Cusps (of small flaps the are pushed together and closed when under pressure). The valve between the left atrium and ventricle is called the Bicuspid because it has two cusps, of more often called the Mitral Valve because its two cusps look like a bishops hat.
Blood travels from the right atrium to the right ventricle through the tricuspid valve. It then goes through the pulmonary artery to the lungs, where it becomes oxygenated, then back to the heart via the pulmonary vein. From the left atrium it goes down through the bicuspid valve to the left ventricle, then it's off to the body again via the aorta (the 'almighty artery' as I like to call it lol).
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