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My study materials use the word vesselcompression chamber of aorta to emphasize aorta's elastic property.

The arch of the aorta only coils, not its straight part. I think the reason why the arch coils is the elasticity of aorta (artery) is high. If the elasticity is too high, then the aorta is stiff. This means that heart has to work harder so higher systolic pressure and lower diastolic pressure.

Why does the arch of the aorta coils?

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It's not clear to me what you mean by "coils". The aorta itself does not coil. Except for the arch, it's rather straight. Are you asking about the orientation of collagen and elastic fibers in the wall of the aorta? –  kmm Feb 8 at 13:44
    
@kmm This was the question which I got. It probably refers to the fact that it coils very little, exactly in the arch. Yes, I think the coiling of aorta can refer to the orientatino of collagen and elastic fibers in the wall of the aorta. –  Masi Feb 8 at 15:21
    
So if that is the case, then can you rephrase or narrow down your question? –  kmm Feb 8 at 16:51
    
@kmm I narrowed to question to the arch. –  Masi Feb 9 at 7:34
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@Masi - I'm still confused by "coils." The aorta, as you said, is an elastic artery, and has many layers of smooth muscle and elastic fibers in the tunica media. Don't you mean: "if elasticity is low, then the aorta is stiff"? It requires high elasticity to help maintain a higher diastolic pressure. –  jello Feb 11 at 12:46

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