Negative Feedback Mechanisms

Negative feedback mechanisms are found in the regulation of blood pressure, heart rate, and internal temperature controls. For example, the normal internal temperature for the human body is approximately 98.6˚F. If the body temperature rises because of exercise, the body will start to try and cool itself off. This happens through coordination between the hypothalamus and the various body systems that are affected. Signals are sent that allow blood vessels to return to the normal state, sweat to be produced, pores to be dilated, and heart and breathing rate to normalize. This is very similar to the way a thermostat works. When the temperature of a room becomes too warm, the thermostat will switch on the air conditioning and cool the room. When the room temperature reaches a set desired temperature, the system turns off.

Example 1

Example 2

Example 3