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It starts with an impulse, a reaction with the sensory nerves causes a signal to be sent to the brain, for example the pain felt by touching a hot candle.
The stimulus is then sent to the spinal cord from that sensory nerve, to the Peripheral Nervous system, including Cranial and Spinal Nerves, then to the Central Nervous System, or through the spine to the brain where the impulse is made what to do.
After the brain receives this impulse, It sends another signal to the affected area through the PNS, and to the Motor division, which conducts impulses the brain gives it.
These are the Nerve cells, they work by receiving stimulus from motor Neurons, and carry an electrical charge, converting it into ACH, in order to stimuate the Muscle casing a reflex that happens very fast.
The motor Neuron then goes to the somatic nervous system, which is the voluntary system that reacts to that impulse, the nerve then strikes the muscle cell using a synapse, that almost touches it, this then causes the muscle to contract and move within a fraction of a second.
The Parasymphetic division, then sends an imluse all the way back to your brain letting it know that it is no longer exposed to that danger. This division also promotes the housekeeping function during the rest, as the other parts of the body work to prepare what is broken, and get ready for the next time your body comes in contact with something threatening.
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