Why is Aorta sometimes called Compression chamber?
The aorta is a compression chamber because it is an important drive for diastolic perfusion. To keep the blood flowing constantly, and not only during systole (as would be the case with a rigid aorta), the high elasticity of the aortic walls allows it to dilate as a consequence of the high systolic pressure. This allows the aorta to accumulate blood in its proximal part, which is then propelled by the passive elastic contraction of the aorta during diastole.