The semilunar valves stop the back flow of blood into the heart. There is a semilunar valve where the aorta leaves the left ventricle and another where the pulmonary artery leaves the right ventricle.

As an illustration of the importance of these metabolic lung functions in human disease, we may consider the effects of occlusion of a branch of the pulmonary artery, such as those after pulmonary ...

Background Hypoxic pulmonary vasoconstriction leads to an increase in pulmonary artery pressure (PAP) and potentially right ...