What is the primary function of the hormone thyrotropin-releasing hormone (TRH) in the hypothalamic-pituitary-thyroid axis?

A Stimulate the release of thyroid-stimulating hormone (TSH) from the anterior pituitary gland ✓
B Inhibit the release of TSH from the anterior pituitary gland
C Regulate the expression of genes involved in glucose metabolism
D Modulate the activity of immune cells

Explanation

TRH is a hormone produced by the hypothalamus that stimulates the release of TSH from the anterior pituitary gland, which in turn regulates the production of thyroid hormones by the thyroid gland.

Mnemonic

TRH = Thyroid Regulator Hormone

Source

Guyton and Hall Textbook of Medical Physiology
Hormones and Endocrine Markers Endocrinology Hypothalamic-Pituitary-Thyroid Axis Medium MEDICAL Confidence: high