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health advisory Hospital Doctor Yu 2007-11-8 19:09:42

Helpful analogy? Just my 2c logially.

Also, in terms of structural integrity, the more curved somethign is, the stronger it tends to be. A circle is one of the more stable structures. A slight curve isn't as good, but it's better than a straight line.

Also, as one other poster said, since the muscles have a certain amount of tension and we're not double-jointed usually, the muscles will tend to pull slightly on the bones they attach to, thus slightly bending the arm, methinks. But evolutionarily it simply may have been due to ancestors with straighter arms getting hit or falling down and being unable to absorb the impact, thus causing breakage, inability to effectively hunt/gather food or feed oneself, death (thus no procreation) and loss of that genetic structure in the genome.

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Full extension of the elbow joint requires contraction of the tricep, which requires energy. A slight bend to the arm lets both the bicep and tricep remain relaxed.

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