semilunar valves are called semilunar because they look like half a moon. If something is not full in biology it is called 'semi' and lunar means the moon. So basicaly its cal…led that because the valve looks like a half moon. (MORE)
After the semilunar valve, blood goes in two places (due to the fact that there are two semilunar valves). There is the aortic valve and the pulmonary valve. The aortic vavle …sends blood out of the heart and into the arteries. the pulmonary valve sends blood to the lungs where it can receive more oxygen for the body. (MORE)
The semilunar valves or the Aortic and Pulmonary valves opens when the ventricles of the heart contract. They allow passage while preventing back flow of blood. The closure o…f both contributes to the Second Heart Sound (S2) .
In contrast the atrioventricular valves (mitral and tricuspid valves) open when the atria contract allowing blood to flow into the ventricles and again, preventing back flow. Their close makes the first heart sound (S1). (MORE)
The aortic semilunar valves function is to close the left ventricleof the heart so the blood does not flow backwards into the heart.It is the one, with its partner the pulmona…ry semilunar valve, thatmakes the softer 'dupp' sound in the heartbeat. (MORE)