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17. What is meant by reflex-action? With the help of a labelled diagram trace the sequence of eventswhich occur when we touch a hot object.

Answer»

The action which doesn't require brain to response and does it itself by the help of spinal cord is called reflex action.It is a quick sudden response to the stimuli. e.g. (1):lifting of hand when touched by a hot object, (2):closing of eyelids when an insect comes in front of our eye.

The pathway:Receptor >sensory neuron>spinal cord>motor neuron>Effector



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