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A "brain" is commonly considered to be the source of all actions and thinking in an animal (except, of course, reflexive actions). All muscles coordinate themselves through the brain's direction, assuming the nervous system is operating normally, and the brain senses many different values from the nervous system and makes appropriate reactions from those values.

In comparison, a CPU (or "processor") is responsible for processing inputs and generating output between all other components in a system (except those offloaded to dedicated circuitry, such as DMA). Even then, all major interaction between various components is initiated by the processor, similar to the various parts of an animal brain that is responsible for coordinating the organism's organic systems.

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13y ago

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