In this beautiful picture 3 or the heart valves can be seen: tricuspid valve between the right atrium and the right ventricle. mitral valve between the left atrium and the left ventricle. aortic valve between the left ventricle and the aorta. Image by: https://www.instagram.com/p/CL0KKTvB8Mr/?igshid=l73qqnqufkdn