Homeostatic Mechanism



Think about your home heating and cooling system. You most likely have a thermostat somewhere in the main part of your home or apartment. Inside the thermostat is a thermometer that measures the temperature of the air. If you have your house thermometer set at 78 degrees Fahrenheit in the summer, anytime the temperature in the room goes above 78 degrees, the thermostat registers the change and sends the electrical signal to your air conditioning system, which turns on and provides cool air to your home. As the inside air temperature decreases toward 78 degrees, the thermostat sends another signal to turn the cooling system off.

In much the same way, the body has homeostatic mechanisms for regulating its internal environment.

In this assignment, you are required to write a short paper (1–2 pages), in which you describe the homeostatic mechanism that:

Regulates your body temperature when you are outside on a cold winter day.
Regulates osmolarity, or solute concentration, of the blood in response to a meal high in salt.

In each case, describe the stimulus, receptors, integrator, and effector; the negative or positive feedback; and the tissue types involved in the body’s response.


Homeostatic mechanism is a physiologic system either open or closed that control or regulates its internal environment and tends to maintain a steady, constant condition. In this case, when it is very hot the mechanism provides cooling systems to cool the body and when it is very cold the system provides heat for the body. For instance the body temperature is sensed by the hypothalamus to be too high or low. If the temperature is above normal, it is sensed by the hypothalamus that a change should be made in order to reduce the amount of blood sent to the heating area or reverse the heating of the area. As a result, the body temperature is cooled and return to the normal temperature to be maintained.