The secretion of thyroid hormones is controlled by a. TSH...

The secretion of thyroid hormones is controlled by ______
a. TSH from the hypothalamus
b. TSH from the anterior pituitary
c. thyroxine from the anterior pituitary
d. thyroglobulin from the thyroid's parafollicular cells

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Key Concepts

Hypothalamic-Pituitary-Thyroid (HPT) Axis

The HPT axis is the body’s regulatory system that controls the production and secretion of thyroid hormones. It involves the hypothalamus releasing thyrotropin-releasing hormone (TRH), which acts on the anterior pituitary to release thyroid-stimulating hormone (TSH), thereby stimulating the thyroid gland to produce thyroid hormones. This axis ensures that thyroid hormone levels are maintained within a narrow, optimal range through a series of feedback mechanisms.

Thyroid-Stimulating Hormone (TSH)

TSH is a key hormone produced by the anterior pituitary that directly controls the thyroid gland's activity. By binding to receptors on the thyroid, TSH promotes the synthesis and secretion of the thyroid hormones, thyroxine (T4) and triiodothyronine (T3). The production of TSH is regulated by signals from the hypothalamus and the circulating levels of thyroid hormones, creating a feedback loop to maintain balance.

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