Home / Body & Disease Mechanisms
Homeostasis: Keeping Systems in Balance
Homeostasis keeps internal conditions within workable ranges through continuous adjustments that depend on context.
#Stability requires continuing adjustment
OpenStax uses homeostasis to explain how the body monitors and adjusts internal conditions. Physiological values fluctuate within ranges rather than staying frozen at one number. Temperature regulation is one example of the body responding to change while maintaining conditions needed for functioning.
Balance here means ongoing regulation, not perfect stillness. This introductory model is not a set of clinical reference ranges. It cannot tell whether a particular reading is normal for an individual or whether a symptom reflects a problem with regulation.
#Negative feedback opposes a change
In OpenStax's feedback model, a sensor detects a physiological value, a control centre compares it with the regulated range and an effector produces a response. Negative feedback acts against the initial deviation. In temperature regulation, increased sweating can help the body lose heat when it becomes too warm.
The word negative describes the direction of the feedback, not whether it is harmful. Likewise, the control-centre model is a way to describe a process; it does not imply that every system has one simple switch or that the body always restores balance successfully.
#Positive feedback has a different role
OpenStax contrasts negative feedback with positive feedback, which strengthens an initial change. It uses childbirth and local blood clotting as examples of processes that amplify a response until an endpoint is reached. Positive does not mean good, just as negative does not mean bad.
Both terms describe how a response relates to the change that started it. Neither is a diagnosis or a treatment goal by itself. This page offers no method for correcting temperature, blood pressure, glucose or other measurements; personal concerns need assessment in their clinical context.
Source note
The sections above were checked against the linked sources. No clinical review has been performed. This is general research education, not a clinical guideline.