Match the terms to their definition. 1. homeostasis small organ attached to the brain that links the nervous system to the endocrine system 2. negative feedback an action that is caused by a stimulus 3. pituitary gland any change that occurs inside of an organism that produces a response 4. stimulus a homeostatic response to a stimulus that slows or stops the output of a system 5. response any change that occurs outside of an organism that produces a response 6. internal stimulus a change in an organism's environment that produces a response 7. external stimulus the maintenance of a relatively constant state in the internal environment of an organism