Define negative feedback. Give an example.
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Answer:
The thermostat is a prime example of negative feedback, and we see the same thing happen in the biochemistry of living things. Negative feedback is a regulatory mechanism in which a 'stimulus' causes an opposite 'output' in order to maintain an ideal level of whatever is being regulated.
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Negative feedback occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances.
Examples of processes that utilise negative feedback loops include homeostatic systems, such as:
Thermoregulation (if body temperature changes, mechanisms are induced to restore normal levels) Blood sugar regulation (insulin lowers blood glucose when levels are high ; glucagon raises blood glucose when levels are low)
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