positive feedback and negative feedback?

Question

whats the differences between the two and what are the similarities between the two?

Answer 1

Negative feedback involves a stimulus resulting in an opposite reaction. For example, high temperature detected by thermoreceptors results in sweatting which will cause a fall in temperature. The fall in temperature means that the stimulus has been removed and sweating therefore stops.

Positive feedback involves a stimulus resulting in furthering a response. Eg. depolarization of a cell causes sodium to enter, which furthers depolarization, causing even more sodium to enter more rapidly.

Answer 2

In the context of biology positive feed back would be a process which increases intensity. Negative feedback would be the opposite. For example, in the body enzyme A causes the production of enzyme B. In a positive feedback system the enzyme B product loops back to cause more enzyme A production which in turn increases the production of enzyme B. This cycle continues increasing both enzyme A and B. In a negative feedback system, A produces B but B then stimulates the reduction of enzyme A slowing down the process. A biology text should be able to give you specific examples of these processes.

Answer 3

Both are regulatory mechanisms.

Negative feedback is like the thermostat in your ref. When the required temperature is reached (they call this the set point), the thermostat turns the cooling system off. Of course since the cooler is "off", after a while the ref heats up and this temperature increase causes the thermostat to turn the system back on so the temperature is returned to the set point. You probably have heard your ref turn on and off automatically. This is similar to what happens in human bodies maintaining "normal" body temperatures.

Positive feedback does not have this see-saw relationship. It's like your pressure cooker. The hotter the it becomes, the greater the pressure inside it gets. This cannot go on forever. Something's got to give! The vent on top of the cooker is there for that purpose. In humans, coughing and birthing are often given as examples of positive feedback. (things comes out of the body in both examples)

Answer 4

Negative feedback can be likened to an inverse relationship between two variables. In other words, when one variable goes up, the other variable will go down so that equilibrium (or balance) is reached. For example, when the weather is very cold, your body interprets the extreme decrease in temperature and you shiver --- the coldness is a DECREASE in temperature & the shivering INCREASES your body temperature.

Positive feedback is just the opposite; when one variable goes up, the other goes up as well (or both can go down). From my understanding, positive feedback STRAYS away from an equilibrium state. Your variables continue to move in just one direction. For example, you may have heard the saying, "the rich get richer." The "action" state is only going in one direction, which (in this previous case) is UP.

Hope this made sense. . . Good luck!

Answer 5

properly, i've got faith a superb feedback is what we call efficient criticism... you realize, it compliments what you do. this is a superb opinion. A damaging feedback is while human beings say what you probably did isn't authentic or isn't eye-catching. A damaging opinion. does not compliment :) i wish this is what you have been searching for.

Answer 6

Hi Diana, Positive very good. Negative not very good.Not similar at all. Do you need help!!

Clowmy

Answer 7

positive feedback --The horse didn't swallow
negative feedback-- The horse swallowed
similarities--swallow
differences--ED
I got this information from the horses mouth, his name is Mr.ED

Answer 8

well you are confused