part of aorta aortic valve 2010-04-14T09:22:13Z BTO:0004628 BrendaTissueOBO One of the four valves in the heart, this valve is situated at exit of the left ventricle of the heart where the aorta begins. The aortic valve lets blood from the left ventricle be pumped up into the aorta but prevents blood once it is in the aorta from returning to the heart. mgr