Anatomy and Physiology Help?

Question

Descibe negative feedback and give be an example of how it works in the body?

Answer 1

Negative feedback (shortened to NFB) is a type of feedback in which the system responds in an opposite direction to the perturbation. It is a process of feeding back to the input a part of a system's output, so as to reverse the direction of change of the output. This tends to keep the output from changing, so it is stabilizing and attempts to maintain constant conditions. This often results in equilibrium (in physical science) or homeostasis (in biology) such that the system will return to its original setpoint automatically.

In contrast, positive feedback is a feedback in which the system responds in the same direction as the perturbation, resulting in amplification of the original signal instead of stablizing the signal. Both positive and negative feedback requires a feedback loop to operate, as opposed to feedforward, which does not rely on a feedback loop for its control of the system.

Examples of the use of negative feedback to control its system are: thermostat control, phase-locked loop, hormonal regulation, and temperature regulation in animals.

Answer 2

Negative Feedback is when the body fails to counteract a change in homestasis. Instead it aids the change, helping it to continue. An example of this is the contractions experienced during labor. Instead of subsiding, contractions get worse and worse, because the body releases a certain chemical that increases these contractions. It's opposite of positive feedback, which reacts to a change in homestasis by releasing responses to certain areas of the body to return the body to homestasis, or in other words, a constant state of wellness. It's kind of a vague explanation, but I hope I helped.

Answer 3

It is actually much simpler than that. Negative feedback is the process of diminishing or attenuating a response to a given stimuli. This means that a negative feedback will make some impulse to lessen. An example of negative feedback would be how your body responds to blood-sugar levels. As your blood-sugar levels increase, your metabolism takes steps to reduce the level of sugars. The presence of sugar causes a negative feedback that will cause the lessening of sugar in your bloodstream.