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Feedback Mechanisms

Negative Feedback- the output shuts off the original stimulus or reduces its intensity. These mechanisms cause the variable to change in a direction opposite of the initial change in order to return it to its ideal value. They help to maintain a physiological function.

Positive feedback- the response enhances the original stimulus so that the activity is accelerated. The change that occurs proceeds the same direction as the initial change to deviate further from the original value. These mechanisms control unusual events that do not require continuous adjustments.

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Anatomy and Physiology

By Marielle Parker