Mitral valve. Located between the left atrium and the left ventricle. Aortic valve. Located between the left ventricle and the aorta. As the heart muscle contracts and relaxes, the valves open and ...

2 Center for Molecular and Human Genetics, Research Institute at Nationwide Children's Hospital, Columbus, Ohio, USA 3 The Heart Center and Center for Cardiovascular and Pulmonary Research, Research ...