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
This is the valve of the vena cava inferior and the right atrium, also known as the valvula venae cavae inferioris. It is shaped like a half moon.
The term septum is not a valve but a wall somewhat like a bedroom wall.
The chordae tendineae, or heart strings, are cord-like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart.
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.
half of a clock
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.
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!
CROISSANT?