Negative Feed Back:
When there is an opposite reaction due to any change in the internal body fluid, It is called Negative feed back. For example, when more sweet is taken in the food, the amount of glucose becomes high in blood. Due to this change a system becomes active and takes part to decrease the amount of glucose, after that its amount is regulated. It is the negative feed back.
Positive Feed Back:
When there is a change in the internal body system and it is further increased by the process, it is called positive feed back. For example in warm blooded animals when internal body temperature is increased due to heat-stroke, the body temperature is further increased. It is the positive feed back. It may be useful in some conditions but may be harmful in other conditions.
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