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
eg;urm... babies sucking on anything placed on their cheek
knee jerking when doctor taps it with hammer
eyes contract(pupils get smaller) when there is too much light
in common day today life look when u r sitiing in a hotel n smell of a fresh yummy burger n u should have notice saliva will be produce in ur mouth this iz reflex action because u cant stop the saliva to not produce.