In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action1 and nearly instantaneous response to a stimulus.23
For other uses, see Reflex (disambiguation).
"Reflectory" redirects here. For the album, see Reflectory (album).
Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain, so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.
