What is feedback mechanism?

What is feedback mechanism ?
A. Feedback mechanism: Feedback is a part of a cause and effect loop, where information about a system is returned to the controller of the system to improve its performance.
Ex 1: Body ability to control temperature.
The condition of body’s temparature is the informa¬tion feedback to the brain which is the controller. If the temperature is high, the body sweats in order to cool down since the process of sweating is done to stop the temperature change. This is a negative feedback mechanism.
Ex 2 : Anger and fear are also examples for feedback mechanism. When adrenalin is increased in the blood, we feel anger. This condition is feedback to brain, controls the adrenalin level to become normal.