How Negative and positive feedback Maintain body homeostasis

NEGATIVE FEEDBACK:

Most homeostatic control mechanisms are NEGATIVE FEEDBACK MECHANISMS. In these systems, the output shuts off the original stimulus or reduces its intensity. These mechanisms cause the variable to change in a direction opposite to that of the initial change, returning to its ideal value. The body's ability to regulate its internal environment is fundamental, and all negative feedback mechanisms have the same goal: to prevent sudden severe changes within the body.

POSITIVE FEEDBACK:

In POSITIVE FEEDBACK MECHANISMS, the response enhances the original stimulus so that the activity is accelerated. In positive feedback mechanisms, the change that occurs goes in the same direction as the first disturbance, causing the variable to deviate more and more from its original value or range. Where as negative feedback mechanisms maintains physiological function or keep blood chemicals within narrow ranges, positive feedback usually controls infrequent occurrences that do not require constant adjustments.