Describe how negative and positive feedback maintain body homeostasis.
Describe how negative and positive feedback maintain body homeostasis.
Homeostasis is described as a stable internal environment of the body, and it is maintained and regulated by the various feedback mechanism of the body. There are two types of feedback mechanism; negative and positive.
In a negative feedback mechanism, the output of a process tends to counteract the initial trigger. Thus, it brings the body condition to its normal value; for example, regulating body temperature by constriction or dilation of blood vessels (when the internal temperature falls below normal, the feedback mechanism leads to vasoconstriction, and when the temperature exceeds the normal value, the feedback mechanism causes vasodilation). In contrast, the positive feedback mechanism functions so that the output signal amplifies the initial trigger and helps in enhancing the rate of any physiological activity; for example, the clotting of blood involves a positive feedback mechanism (the activated thrombin triggers the activation of other clotting factors which increases the conversion of prothrombin into thrombin and help in the formation of a clot).
Step by step
Solved in 3 steps
