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Feedback control

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Biological control systems can keep variables (e.g. body temperature) constant without having a reference or command signal like those in an engineering control system. How do you think feedback control is accomplished when there is no signal to compare to the actual value of the controlled variable?

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Feedback control works by sensing the level of whatever is released, and adjusting when this level is too high or low. This can be done indirectly. For example, brain centers that ...

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