The positive feedback loop is not as common in organisms. When the body detects a change or stimulus during a positive feedback loop, instead of neutralizing the change, the body works to increase the change. The body produces a response that increases the stimulus.

Source: Rotten Apple, All posters.com

Have you ever heard the phrase “one rotten apple can spoil the whole basket”? That phrase means that one person’s actions can have a negative effect on those around him or her. There is science behind that statement demonstrating an example of a positive feedback loop.

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Source: Blood Clotting, WedMD

Blood clotting is another example of a positive feedback loop. If you have an injury and start to bleed, your body starts to build a clot. Once your body notices it is building a clot, it works faster and faster until the bleeding stops. The clotting process, which is the reaction to the change in the body, accelerates.