The brain structure that makes up part of the HPA axis is the

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The hypothalamus is a key structure in the HPA (hypothalamic-pituitary-adrenal) axis, which plays a major role in regulating the body's stress response. When the hypothalamus detects stress, it releases a hormone called corticotropin-releasing hormone (CRH), which signals the pituitary gland to release adrenocorticotropic hormone (ACTH). ACTH then travels to the adrenal glands, where it stimulates the release of cortisol, a stress hormone.

The Brain Structure That Makes Up Part of the HPA