INVOLUNTARY+RESPONSES+OR+REFLEXES

=The receptor cell senses an __stimulus__ and send a nerve impulse (electrical signal) along the __sensory neuron__, which reaches the __spinal cord__.= =.- As it has to be performed very quickly, the information does not go to the brain. Inside the spinal cord, an associated neuron passes the nerve impulse from the sensory neuron to the corresponding motor neuron.= =.-Then, the nerve impulse travels along the motor neuron to the effector( a muscle). This action is performed very quickly, because only two synapses (sensory neuron--associated neuron and associated neuron--motor neuron) are involved.= =.- For example, when we touch something which is too hot, we automatically take the hand away. This is a reflex action.=