Arch: The arch is curved because that's the way it develops as the embryo/fetus grows in size in its mother. It it didn't curve and had acute angle turns to get blood to the lower body, the turbulence it caused would be a serious problem.
Answered 9/27/2014
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
4 doctors weighed in across 2 answers
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