The stimulus or physiological variables is the item to be regulated, the maintenance of the feedback loops for the body regulation is called homeostasis (internal activity balance) that is a process that controls the stimulus to each function and how they triggers the response from the body activity. Receptors detects the changes in stimulus and Integrators compare the variable in relation to a set point to singnal the effectors to generate a physiological response.
Somo of the most showed examples of the homeostasis and the feedback loops are:
-Control of body temperature;
-Control of blood glucose.
Resume:
-The name of the process that controls the balance of the physiological variables of the body is: Homeostasis;
-The responsible to start a feedback loop is: the Stimulus (positive or negative);
-The stages for a feedback are: Stimulus ---> Receptors ----> Integrators -----> effectors;
Therefore, for this process the variable that changes in a feedback loop is the stimulus.