0 one of the valves (= structures that open and close) that stop blood from returning into the ventricles (= lower spaces) of the heart -- 半月瓣
It may be difficult to align both cardiac chambers in the same tracing; instead, the cursor can be placed across an atrial wall and a semilunar valve.
Malformations of the semilunar valves produced in chick embryos by mechanical interference with cardiogenesis.
The fourth stage, ventricular ejection, is when the ventricles are contracting and emptying, and the semilunar valves are open.
The conus arteriosus has a variable number of semilunar valves.
It is placed above and to the left of the atrioventricular opening, and is guarded by the pulmonary semilunar valves.
Its orifice is guarded by the aortic semilunar valves.
The aortic and pulmonary semilunar valves separate the left and right ventricle from the aorta and the pulmonary arterty respectively.
The aortic valve and the pulmonary valve are the two semilunar valves of the heart.
