The hypothalamic–pituitary–adrenal axis is a neuroendocrine axis that controls the secretion of corticosteroid stress hormones. The HPA axis has three components: the hypothalamus, the pituitary gland
Schematic overview of the hypothalamic-pituitary-adrenal (HPA) axis. Stress activates the HPA-axis and thereby enhances the secretion of glucocorticoids from the adrenals.
Cortisol
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Cortisol is a steroid hormone in the glucocorticoid class of hormones and a stress hormone. When used as medication, it is known as hydrocortisone.
Hypothalamic–pituitary–adrenal axis
…gland to secrete adrenocorticotropic hormone (ACTH), once known as corticotropin. The adrenal cortex: It produces glucocorticoid hormones (mainly cortisol in humans) in response to stimulation by ACTH. Glucocorticoids in turn, act back on the hypothalamus and pituitary (to suppress CRH and ACTH production…
Change in plasma cortisol cycle (mcg/dL) over 24 hours