Which 2 valves touch deoxygenated blood? Which 2 valves touch oxygenated blood?

The two valves that touch deoxygenated blood are the pulmonary valve and the tricuspid valve. The pulmonary valve is located between the right ventricle and the pulmonary artery, and it prevents the backflow of blood into the right ventricle after it has been ejected into the pulmonary artery. The tricuspid valve is located between the right atrium and the right ventricle, and it prevents the backflow into the right atrium after it has been ejected into the pulmonary artery.The two valves that touch oxygenated blood are the aortic valve and the mitral valve. The aortic valve is located between the left ventricle and the aorta, and it prevents the backflow of blood into the left ventricle after it has been ejected into the aorta. The mitral valve is located between the left atrium and the left ventricle, and it prevents the backflow of blood into the left atrium after it has been ejected into the aorta.