Humans' rapid, spontaneous response to stimuli (sudden change in the environment) is known as reflex action. The sensory nerves, which detect the stimuli, are linked to the motor nerves, which control muscle movement. A reflex arc is a relationship between perceiving the signal from receptors (input) and immediately responding to it (output) through effectors. In a reflex action, the reflex arc is the channel for signalling between receptors and effectors. The sensory and motor neurons that connect to each other in the spinal cord are responsible for the signalling. Although reflex arcs originate in the spinal cord, the information (input) is sent to the brain. The signal and response that have occurred are the only things that the brain is aware of. This knowledge is stored in the brain's memory. This aids in the conditioning of specific reflexes. The brain, on the other hand, has no part in the production of the response.