Why isn’t our dominant hand’s bicep disproportionally larger than our non-dominant hand’s bicep?

Question

Considering we use our dominant arm for lifting, most tasks, holding things, etc.

In: Biology

Answer 1

Bones make up for it. ‘Wolffs law’ isn’t ELI5, but to simplify bone density increases or decreases based on repeated loads placed upon them. For athletes where a dominant arm plays a big role; such as tennis and baseball players, there can be a ~15-20% difference. Your neural connection to dominant arm is also stronger.
So while the muscles might make it seem like there isn’t that much of a difference there is more going on beneath the surface.