The main function of the mitochondria is to transform ADP to ATP. A good analogy is that ADP is an uncharged battery and ATP is a charged battery, so the mitochondria are the rechargers.
The ATP can be used in other parts of the cell to make something useful, like moving or building a molecule. To use it, the ATP is split and it produces ADP. So they are like a battery.
The function of mitochondria is totally unrelated to the function of CPU and brain.
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[ 3.0 ms ] story [ 16.2 ms ] threadThe main function of the mitochondria is to transform ADP to ATP. A good analogy is that ADP is an uncharged battery and ATP is a charged battery, so the mitochondria are the rechargers.
The ATP can be used in other parts of the cell to make something useful, like moving or building a molecule. To use it, the ATP is split and it produces ADP. So they are like a battery.
The function of mitochondria is totally unrelated to the function of CPU and brain.
Anyway, I think that ribosomes have a very restrictive type of "calculation", you can compare them with a Jackard Loom https://en.wikipedia.org/wiki/Jacquard_loom or a Pianola https://en.wikipedia.org/wiki/Player_piano . Perhaps an old programmable calculator.
Currently the CPU have a lot more of computational abilities.