If the still left ventricle contracts, it pumps blood with the aortic valve and in to the aorta. The blood to start with enters the ascending aorta, a section in the aorta that moves up toward The top. Balanced arteries—such as the aorta—have strong partitions, produced up of 3 layers: https://sgvasculargrp.com/medical-condition/aortic-aneurysm/