What are the difference between positive and negative?

Answer 1

Negative feedback is when a downstream product negatively feedsback on an upstream process. An example would be eating - as you eat, food accumulates in your stomach and negatively feedbacks to make you not hungry. Countless enzymes are also negatively inhibited by their products or downstream products.

Positive feedback is far less common, at least in biological systems and leads to 'runaway train' events typically ending in an explosive event, such as giving birth. negative feedback are mechanisms functioning primarily to restore the body to homeostasis or balance. they occur constantly within the body as it tries to adjust to events inside it. example if your blood pressure is high, the body usually responds by dilating the blood vessels, decreasing the heart rate, etc. to lower the BP. positive feedback on the other hand, allows the event to go on continually until such time it stops. this is far less common and is not considered a homeostatic mechanism. the most concrete example of this is giving birth. the vagina expands continually until such time the baby is expelled. - thoughtfulobserver.