A feedback loop is a mechanism which is used to maintain homeostasis. Homeostasis is a process by which organisms keep internal conditions constant even there are changes in the external environment. In simple terms a feedback loop checks and balances system within the body to keep hormone levels as required. Let’s understand this with an example: When your body temperature increases, certain receptors detect the change and send a message to the hypothalamus of brain it stimulates the sweat gland to produce more sweat which gives cooling effect to the body and brings body temperature to normal.