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In the negative feedback control system of the papillary light reflex, what are the physiological
processes that represent what engineers call the controller, plant, feedback element, controlling,
controlled, feedback variables?
Solution
EdingerWestphal nuclei of brain (controller) lead to change in neural traffic down the efferent
nerves back to the eyes (controller action). It affects the plant retina by feedback sensors
sphincter muscles and radial dilator muscles which relax and contract respectively. The output is
increase in pupil area.

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In the negative feedback control system of the papillary light refle.pdf

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