Homeostasis can be split into two categories, Negative feedback and Positive feedback. In the Negative feedback process the control centre will send signals to shut off, or reduce the intensity of the original stimulus, for example when your body heat increases through running, negative feedback is delivered to maintain a moderate body temperature. The cells of the control centre are no longer stimulated by the sensory nerve endings meaning the effects are negated.
Positive feedback heads in the same direction as the original stimulus. For example a person wanting to pass urine but not having a place to do so would have an increasing urge as time passed, this would continue until the stimulus was no longer present. Once urine had been passed the stimulus is no longer present and the urge has passed.
Tucker, L 2005 Anatomy & Physiology Cambridge Holistic Therapy Books
Berne, RM 1993 Physiology Missouri Mosby [continues]
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