hey youtube i was asked to explain the difference between negative and positive feedback loops along with some examples so let's just jump right in i think the first step to knowing the difference between negative versus positive feedback loops is to understand why they occur so why why does our body go through these mechanisms of feedback loops well i have one word that should answer your question homeostasis so what is homeostasis homeostasis is the stability of the body's internal environment and there are countless amounts of physiological processes that our bodies undergo every day to maintain the state of balance the body's internal environment is made up of something we call variables these variables could be things like body temperature or the chemical components in our blood and other body fluids and if one of these variables become imbalanced we may begin to feel sick or imbalanced ourselves for example if we have too much sugar in our blood we may begin to feel confused dizzy or even nauseated here's another way you can look at it each cell in our bodies has a small amount of fluid surrounding it if one of these variables such as the amount of fluids surrounding the cell or the chemical components in the fluid surrounding the cell become too thick or too salty it may be hard for that cell to function properly under those conditions so our body must maintain internal stability so the cells in our body can do their job properly now let's talk about set points and normal range all variables must remain at a set point but because our bodies may sometimes fluctuate no one's body can always remain at an exact set point at all times so our bodies will maintain something called a normal range one example is our blood's ph level the blood usually maintains a ph level of 7. 4 this doesn't necessarily mean that the blood will always be at 7. 4 exactly but our blood may maintain a ph close to this value usually around 7.
35 to 7. 45 if the blood ph stays within these values it may not be a set point of 7.
