semilunar valve

Finally there are the two semilunar valves, found at the beginning of the arteries leaving the heart.

Blood is then pumped through the semilunar valve and into the pulmonary artery.

The semilunar valves of the heart are associated with neural crest cells according to new research.

Oxygenated blood enters the systemic circulation when leaving the left ventricle, through the aortic semilunar valve.

Here, it is pumped out of the pulmonary semilunar valve and travels through the pulmonary artery to the lungs.

Once, the lymph flows into the next lymphangion, it cannot return to the previous lymphangion, as the semilunar valves close tightly.

Many involve narrowing of the atrioventricular valves or regurgitation of the semilunar valves.

This results in the slight increase in aortic pressure caused by the elastic recoil of the semilunar valves and aorta.

Petit's sinuses: Also known as aortic sinuses, the space between each semilunar valve and the wall of the aorta.

The fourth, "ventricular ejection," is when the ventricles are empty and contracting, and the semilunar valves are open.

The normal heart sounds, S and S, are produced by closing of the atrioventricular valves and semilunar valves respectively.

The fibrous rings surrounding the arterial orifices serve for the attachment of the great vessels and semilunar valves, they are known as The aortic annulus.

The first, "early diastole," is when the semilunar valves close, the atrioventricular (AV) valves are open, and the whole heart is relaxed.

The third, "isovolumic ventricular contraction," is when the ventricles begin to contract, the AV and semilunar valves close, and there is no change in volume.

It then travels through the mitral valve to the left ventricle, from where it is pumped through the aortic semilunar valve to the aorta.

Pulmonic regurgitation: the backflow of blood from the pulmonary artery into the right ventricle, owing to insufficiency of the pulmonic semilunar valve.

The semilunar valves are directed towards the flow of the lymph and open when the pressure in the first lymphangion is greater than the pressure in the next lymphangion.

Aortic regurgitation: the backflow of blood from the aorta into the left ventricle, owing to insufficiency of the aortic semilunar valve; it may be chronic or acute.

From the right ventricle, blood is pumped through the pulmonary semilunar valve into the left and right pulmonary arteries (one for each lung) and travels through the lungs.

These return waves create the dicrotic notch displayed in the aortic pressure curve during the cardiac cycle as these reflected waves push on the aortic semilunar valve.

Aranzi discovered the 'Nodules of Aranzio' in the semilunar valves of the heart and wrote the first description of the superior levator palpebral and the coracobrachialis muscles.

With age, the aorta stiffens such that the pulse wave is propagated faster and reflected waves return to the heart faster before the semilunar valve closes, which raises the blood pressure.

In fact the smooth muscle within the abdominal aorta is derived from mesoderm, and the coronary arteries, which arise just above the semilunar valves, possess smooth muscle of mesodermal origin.