Right. Consider the function of your heart: to pump blood throughout your body. In a circular organism like this crab, central placement of the heart is physically efficient. It allows for more even distribution with each pump, which in turn places minimal strain on the crab's blood vessels.

It's a simple system, really, made possible by a lifetime of living in water. When gravity isn't as big a force in your life, you can get by with a lot less, anatomically speaking.

[ Ema was hungry twenty tags ago, but now she is only hungry for....... you guessed it, science ]