PATHOLOGY

Detailed explanation-1: -The semilunar valves (pulmonary valve and aortic valve) are one-way valves that separate the ventricles from major arteries. The aortic valve separates the left ventricle from the aorta, while the pulmonary valve separates the right ventricle from the pulmonary artery.

Detailed explanation-2: -Normal heart sounds come in pairs. The sounds are often described as a constant “lub-dub, lub-dub.” The first “lub-dub” is the sound of the mitral and tricuspid valves closing. The second “lub-dub” is the sound of the aortic and pulmonary valves closing soon after.

Detailed explanation-3: -The semilunar valves are located at the connections between the pulmonary artery and the right ventricle, and the aorta and the left ventricle.

Detailed explanation-4: -The semilunar valves closing preventing blood from re-entering the ventricles. After filling with blood, the ventricles contract, and their rising pressure force blood up toward the atria and into the pulmonary trunk artery and aorta.