Heart valve chambers are lined with endocardium. Heart valves separate the atria from the ventricles, or the ventricles from a blood vessel. Heart valves are situated around the fibrous rings of the cardiac skeleton. The valves incorporate leaflets or cusps, which are pushed open to allow blood flow and which then close together to seal and prevent backflow. The mitral valve has two cusps, whereas the others have three. There are nodules at the tips of the cusps that make the seal tighter. The pulmonary valve has left, right, and anterior cusps. The aortic valve has left, right, and posterior cusps. The
Map of the Human Heart gondola but actually on top of the blimp), the other is the final scene of the film which has a twist ending. "Map of the Human Heart" was critically reviewed and found favourable mention from many film critics. Roger Ebert noted: ""Map of the Human Heart" tells a soaring story of human adventure - adventure of the best kind, based not on violence, but on an amazing personal journey. It is incredible sometimes what distances can be traveled in a single human life, and this is a movie about a man who could not have imagined his end in his