Positive feedback mechanisms are characterized by what type of events?

• A. Infrequent events that do not require continuous adjustments.
• B. Continuous adjustments that constantly regulate parameters.
• C. Regular daily fluctuations in body temperature.
• D. Short-lived events that cause immediate removal.

Answer: (A)

Positive feedback amplifies a change and tends to happen in brief bursts until a final outcome is reached. Because the response builds on the initial stimulus rather than stabilizing the system, these events are infrequent and don’t require ongoing, continuous adjustment. Once the endpoint is achieved, the mechanism typically stops. Think of processes like blood clotting or the contractions of the uterus during childbirth—triggered by an initial cue, they rapidly accelerate until the task is finished. In contrast, normal daily variations in body temperature are kept in check by ongoing negative feedback, which continuously nudges the parameter back toward a set point. So describing positive feedback as infrequent events that do not require continuous adjustments best captures how these mechanisms operate.