Thyroid Hormone Regulation: The Negative Feedback Loop
Thyroid hormone levels are maintained through a classic negative feedback loop involving the hypothalamus, pituitary, and thyroid gland (HPT axis):
- The hypothalamus releases TRH (thyrotropin-releasing hormone).
- TRH stimulates the anterior pituitary to secrete TSH (thyroid-stimulating hormone).
- TSH prompts the thyroid to produce T3 (triiodothyronine) and T4 (thyroxine).
- Rising T3/T4 levels inhibit further TRH and TSH release, reducing thyroid stimulation.
This self-regulating mechanism prevents excessive hormone production and maintains homeostasis. Disruptions in this loop underlie thyroid disorders like hypothyroidism and hyperthyroidism.
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