The media of each vessel listed contains some elastic fibres and smooth muscle, however the media of large elastic arteries consists of may concentric elastic laminae. The aorta is the largest elastic artery in the body and therefore, contains the greatest number of elastic fibres. The left ventricle ejects blood under pressure high enough to distend to aorta. The elastic laminae in the media of the aorta expand to absorb some of this pressure and then return the pressure to the system as they relax. This smooths the flow of blood and is energy efficient.