Feedback Mechanism Sketch. Any feedback process, positive or negative, can be represented as having 5 main elements: stimulus, receptor, input, output, and response. Positive feedback is "give me more" and negative feedback is "i have enough". Learn what it is with good examples in detail here. A good example of a positive feedback system involves oxytocin and its other effect: causing contraction of uterine muscle during childbirth (Figure 1.28). Positive Feedback and Rapid Change The counterpart to negative feedback is the positive feedback loop, a process in which the body senses a change and activates mechanisms that accelerate or increase that change. Most of us have, at some point, experienced the infamous thermostat battle in our homes. Summary. The positive feedback accelerates the process of clotting until the clot is large enough to stop the bleeding. This can also aid homeostasis, but in many cases it produces the opposite effect and can be life-threatening. Positive feedback causes an increasing deviation from the normal state to a fixed endpoint rather than a return to a normal set point as in homeostasis. Positive and negative feedback mechanisms in biology thus constitute the precise balancing act required for living organisms to achieve homeostasis. In this case the stimulus for oxytocin secretion is dilation of the uterine cervix. Feedback loops have been identified in a variety of regulatory systems and organisms. What is Negative Feedback. Positive feedback systems are unusual in biology, as they terminate with some cataclysmic, explosive event. When there is enough C in circulation, a negative feedback is sent to the organ producing A, to stop stimulation of B. Figure \(\PageIndex{4}\): Normal childbirth is driven by a positive feedback loop. Lets say A stimulates production of B which is in turn converted to C which is utilized in the body. Positive feedback is often a normal way of producing rapid change. Positive feedback is a self-amplifying cycle in which a physiological change leads to even greater change in the same direction, rather than producing the corrective effects of negative feedback. But what exactly is homeostasis, how does it occur, and why homeostasis is important in living organisms? During the study of life, one of the most important attribute to be aware of is the concept of internal balance or homeostasis.