Learn about The Reflex Action in this educational video from dizzo95.
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Male Speaker: Sometimes we must react quickly to get out of danger. This is the job of the reflex arc. The hot metal activates pain receptors and the nerve message travels up to sensory nerve and into the spinal chord. The nerve impulse is quickly routed through an intermediated neuron and into a motor neuron, which runs straight back to the arm muscle. The connection between nerves are called synopsis. Chemicals flow across a tiny gap and trigger a signal in the neck nerve cell. During a reflex arc, a signal maybe sent to your brain. This gives the sensation of pain, but long before you feel the pain, the reflect arc activates the biceps muscle and pulls your hand from danger.

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