system
Given the following post, respond as if you're commenting on Reddit:
human
Why do our arms and fingers in a relaxed state have a bend to them?

Does having this trait carry an adaptive advantage as opposed to having straight arms and fingers on an evolutionary standpoint?
gpt
You have muscles that, when flexed, curl your fingers/arms. And you have muscles that, when flexed, extend your fingers/arms. It therefore takes effort to go to either of the extremes because you need the muscles to pull hard enough to stretch the opposing muscles. When both sets of muscles are relaxed, the equilibrium position of the joint will be partially bent.