What is a spigot and what does it do?
Answers:
A generic valve is something which ensures unidirrectional flow. We have them contained by some veins and in the heart to help do this, my son.
In anatomy, the heart valve maintain the unidirectional flow of blood in the heart by opening and closing depending on the difference contained by pressure on each side. They are mechanically similar to reed valves.
There are four valve in the heart (not counting the valve of the coronary, the isotonic valve and the spout of the inferior vena cava):
The two atrioventricular (AV) valves between the atria and the ventricles.
The two semilunar (SL) valves, in the arteries going away the heart.
[edit] Atrioventricular valves
This is an explanation of the echocardiogram above. MV: Mitral valve, TV: Tricuspid valve, AV: Aortic stopcock, Septum: Interventricular septum. Continuous lines demarkates septum and free wall seen in echocardiogrm, dotted line is a suggestion of where on earth the free wall of the right ventricle should be. The red line represents where the upper left loop within the echocardiogram transects the 3D-loop, the blue line represents the lower loop.
An artificial heart valve may be used to surgically replace a patient's damaged spigot.These are small valves that prevent backflow from the ventricles into the atria during systole. They are anchored to the wall of the ventricle by chordae tendineae, that prevent the valve from inverting.
The chordae tendineae are attached to papillary muscles that cause tautness to better hold the valve. Together, the papillary muscles and the chordae tendinae are known as the subvalvular apparatus. The function of the subvalvular apparatus is to keep the valve from prolapsing into the atria when they close. The subvalvular apparatus have no effect on the opening and closure of the valves, however. This is cause entirely by the pressure gradient across the valve. Source(s): en.wikipedia.org
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