Processes inside body need to be constant to allow it to function. they have to resist changes from whats going on outside the body and continue to function as usual.
This is done by homeostasis, which detects changes in body and works to bring the body back to usual conditions.
Receptors detect the changes, they inform controllers. controllers decide what needs to be done about the change and send instructions to effectors. effector follows instructions to return body to usual workings. feedback loop tells the receptor that the problem has been solved.
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