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For an instant, unlearned response, it does it with its reflex arc, which is made of 5 elements- (i)a receptor- a sensory organ, like an eye, ear, tongue or touch corpuscle (ii)sensory neuron, (iii)a coordinator neuron, (iv) a motor neuron and (v)an effector which normally is a muscle-either involuntary smooth or voluntary striped muscle.

A receptor receives the stimulus, a sensory neuron carries the impulse in the form of an electric impulse, a coordinator neuron takes the necessary suitable action, a motor neuron carries the decision to the effector and finally the effector brings out suitable response.

Lower animals lack an organized nervous system, but still the mechanism is more or less similar.

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