Tracing the Hypothalamic-Pituitary-Thyroid Feedback Loop, Worked
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This procedure traces one negative feedback loop end to end, from hypothalamic signal through pituitary relay to thyroid hormone release and back, drawing on this chapter's axis and feedback atoms.
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Treating the thyroid as an independently regulated gland is the error here — its output is set by an upstream two-hormone relay, and a malfunction anywhere along that chain, not only in the thyroid itself, can produce the same downstream symptoms.
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