The heart valves- the bicuspid and tricuspid valves- are there to prevent blood from back-welling into the atria after atrial systole (contraction). Once the atria have filled the ventricles of the heart with blood, the valves close- making the "heartbeat sound." The ventricles can then contract. If these valves didn't exist, then the blood would flow back into the atria, and you'd probably have a colossal heart attack and die. Isn't Biology a cheery subject?!
The atrioventricular valve on the left side of the heart is the bicuspid or mitral valve. The AV valve on the right is the tricuspid.
one has three cusps (tri) and the other has two (bi)
left atrioventricular valve and left mitral valve
Right atrioventricular valve
The right atrioventricular valve.
The Tricuspid valve
Mitral Valve
the right atrioventricular valve
Its called the atrioventricular valve or just AV valve
the right AV valve
The bicuspid valve.
The atrioventricular valve acts as a control device between the atria and the ventricles. They prevent blood from moving back into the atria during contraction.