Ok, taken metaphorically, the heart might actually be the combination of the alternator and battery. They power everything else. The engine is like the stomach, converting chemical energy to mechanical energy, and leaving us with some flatulence.
I would argue that they do. The pistons could be seen as analogous to the chambers of a heart. The valves, same. Timing belt is vagus nerve...etc. we're just meat machines if you think about it.
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Women!