ASCP Clinical Chemistry Practice Test 2026 – Comprehensive All-in-One Guide to Exam Success!

The primary function of adrenocorticotropic hormone (ACTH) is to stimulate the adrenal cortex to secrete cortisol. ACTH is produced and released by the pituitary gland in response to corticotropin-releasing hormone (CRH) from the hypothalamus. Its main role is to signal the adrenal glands to increase the production and release of cortisol, a steroid hormone that plays a critical role in stress response, metabolism, and immune system regulation.

Cortisol is essential for various bodily functions, including the regulation of blood sugar levels, maintaining blood pressure, and responding to stress. When ACTH levels rise, they prompt the adrenal cortex to produce more cortisol, thereby participating actively in the body's stress response mechanisms and helping maintain homeostasis. This endocrine interaction illustrates the essential feedback loop between the pituitary gland and adrenal glands in the hypothalamic-pituitary-adrenal (HPA) axis.