Question

what is reflex action ?​

Answer 1

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus.

A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain

Answer 2

Hey mate ☺

Reflex actions are sudden, involuntary reactions of the body in response to stimuli. They occur without the involvement of the conscious areas of the brain. Therefore, all reflex actions are unconscious actions. Somatic nervous system is responsible for reflex arcs. Reflex arc is the path of impulses in the reflex action.

Reflex actions occur both from the brain and spinal cord which are the parts of the central nervous system. Most often these actions are mainly formed from the spinal cord. When sudden responses are required, instructions are given by the spinal cord itself. Impulses reach the brain only after that. Later conscious responses are made. 

Hope it helps you ☺✌✌