Answer:
This statement describes the negative feedback mechanism involving thyroid hormones and the release of thyrotropin-releasing hormone (TRH) from the hypothalamus.
In this mechanism:
Excess thyroid hormone (T3 and T4) in the blood inhibits the hypothalamus from releasing thyrotropin-releasing hormone (TRH).
Less TRH means that the pituitary gland releases less thyroid-stimulating hormone (TSH).
Reduced TSH leads to a decrease in the production and release of thyroid hormones by the thyroid gland.
Lower thyroid hormone levels in the blood then relieve the inhibition on the hypothalamus, allowing it to release more TRH when needed.
This feedback loop helps maintain thyroid hormone levels within a narrow, optimal range in the body.
Step-by-step explanation: