1 - The stimulus is sensed by the pain sensor in the hand, 2 - The nerve impulse is sent along the sensory neurone, 3 - The nerve impulse is passed through a synapse to a relay neurone in the spinal cord, 4 - The nerve impulse is passed through a synapse in the spinal cord to the motor neurone, 5 - The motor neurone forms a synapse in the muscle (effector), 6 - The muscle contracts to move the hand from the object,

The Reflex Arc

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