Sentence examples for semilunar from inspiring English sources

The semilunar valves are pocketlike structures attached at the point at which the pulmonary artery and the aorta leave the ventricles.

These valves, formed by semilunar folds in the tunica intima, are present in pairs and serve to direct the flow of blood to the heart, particularly in an upward direction.

There are two types of valves located in the heart: the atrioventricular valves (tricuspid and mitral) and the semilunar valves (pulmonary and aortic).

The first sound occurs when the mitral and tricuspid valves close, the second when the pulmonary and aortic semilunar valves close.

The second heart sound results from vibrations set up in the walls of the pulmonary artery, the aorta, and, to a lesser extent, the ventricles, as the blood reverberates back and forth between the walls of the arteries and the valves after the pulmonary and aortic semilunar valves suddenly close.

In the human heart, two coronary arteries arise from the aorta just beyond the semilunar valves; during diastole, the increased aortic pressure above the valves forces blood into the coronary arteries and thence into the musculature of the heart.

The three leaflets of the aortic semilunar and two leaflets of the pulmonary valves are thinner than those of the atrioventricular valves, but they are of the same general construction with the exception that they possess no chordae tendineae.

The upper end of the ulna presents a large C-shaped notch the semilunar, or trochlear, notch which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint.

"The semilunar valves work like a dream, catching the water as sails catch wind, closing fast and preventing any leakage.