There are many hormones in the body, soluble chemicals that affect the functioning of organs, tissues and cells. When a chemical is secreted into the circulation by one organ to influence the functioning of another, it is called an endocrine hormone. On the perception of a threat, the hypothalamus in the brain stem releases corticotropin-releasing hormone (CRH), which travels a short distance to the pituitary, a small endocrine gland embedded in the bones at the base of the skull. Stimulated by CRH, the pituitary releases adrenocorticotrophic hormone (ACTH).
ACTH is in turn carried by the blood to the adrenals, small organs hidden in the fatty tissue on top of the kidneys. Here ACTH acts on the adrenal cortex, a thin rind of tissue that itself functions as an endocrine gland. Stimulated by ACTH, this gland now secretes the corticoid hormones (corticoid, from “cortex”), the chief among them being cortisol. Cortisol acts on almost every tissue in the body one way or another—from the brain to the immune system, from the bones to the intestines. It is an important part of the infinitely intricate system of physiological checks and balances by which the body mounts a response to threat. The immediate effects of cortisol are to dampen the stress reaction, decreasing immune activity to keep it within safe bounds.
Proceso y consecuencias del estrés en el cuerpo