There are a lot of disturbances in the internal environment. Here are some examples:
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Internal temperature (negative feedback) - Our bodies maintain a certain temperature of 37°C. If it goes beyond that, it means that there is an infection ongoing. The sensors are nerve cells with terminals in the skin and brain, the control is the brain's temperature regulating center, and the effectors are sweat glands located throughout the body.
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pH level (negative feedback) - Our blood’s normal acid-base balance is between 7.35 and 7.45. Even the slightest imbalance may cause a problem in our body. pH level imbalance are categorized into two: acidosis and alkalosis. Acidosis refers to an over acidic blood that has a blood pH less than 7.35. Alkalosis however, refers to an over basic blood that has a blood pH higher than 7.45. The response of our body and the treatments needed depends on the type of imbalance. When blood pH gets either too high or too low, the body works to bring it back to normal.
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Oxygen saturation (negative feedback) - The percentage of oxyhemoglobin (oxygen-bound hemoglobin) in the blood is measured. A normal oxygen level stays between 95% to 100%. A value less than 90% is termed poor oxygen saturation and necessitates the use of supplemental oxygen supplementation.
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Lactation (positive feedback) - The child feeding stimulates milk production which causes further feeding (continues until baby stops feeding).