The process in which the anatomical structures of the ascending aorta are generated and organized. The ascending aorta is the portion of the aorta in a two-pass circulatory system that lies between the heart and the arch of aorta. In a two-pass circulatory system blood passes twice through the heart to supply the body once. [ http://en.wikipedia.org/wiki/Ascending_aorta GOC:dgh http://www.informatics.jax.org/searches/AMA.cgi?id=MA:0002570 GOC:bf http://purl.obolibrary.org/obo/UBERON_0001496 ]