In the context of the nervous system, a response is the action or change in behavior that occurs as a result of a stimulus. It can be anything from a simple reflex to a complex series of actions involving multiple neural pathways.
An external or internal change that affects sensory receptors and leads to a response in an organism.
Reflex: An automatic, involuntary reaction to a stimulus, often designed for protection or homeostasis.
A specialized cell transmitting nerve impulses; the fundamental unit of the brain and nervous system