Reflex action is a sudden action performed without thinking about it or without feeling in control of our reactions. It is a quick response to changes in the environment. For example, pulling our hand back from a flame reflexly. Reflex arcs have evolved because the thinking process of the brain is not fast enough for such quick responses.

On the other hand, walking is a voluntary action that involves the cerebellum, a part of the hind-brain. The cerebellum is responsible for precision of voluntary actions and maintaining the posture and balance of the body. Walking requires conscious control and coordination by the brain, unlike reflex actions which occur without involving the thinking process.