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Negative Feedback

Feedback occurs when the feedback causes the corrective measures to be turned off. 

Thermoreceptors detect a rise in blood temperature, nerve impulses are sent to the hypothalamus and then the skin. Sweating and vasodilation causes the blood to resume to normal temperature. - This is negative feedback. 

Fall of blood glucose. The islets of langerhans in the pancreas produce glucagon. Glucagon causes the conversion of glycogen to glucose. 

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Positive Feedback

Feedback causes corrective measurements. 

Hypothermia involves positive feedback, when the heat loss from the body is quicker than it can be produced. 

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