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Cerebrum is the part of the brain that acts as coordinating centre. It sends nerve impulses to effectors (ex;muscles) to do work by using the efferent neurons (nerve cells). Impulses travel through nerve system with help neurotransmitters like serotonin and dopamine that carry information from one cell to another. The ammount of neurotransmitter is related to importance and strength of information (resulting in mild to strong pain). However some parts of the body aren't in reach of nerve system and also need some control. That is done by hormones traveling with blood and is much slower than nerves.

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Q: How do brain send signals to all parts of the body?
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