I'm guessing the hard drive.
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I think brain = CPU + Hard Disk + RAM
and heart should be Power supply
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I think both the hard drive and the microprocessor. It's like a 2 in 1 computer part.
I think the motherboard, you need it, the motherboard also can be the heart.
Your brain might also be your operating system, I know it isn't a real computer part, but it does a lot of thinking :)
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