One, the homeostatic portion, is primarily concerned with making sure we've got enough energy to keep going and is localized to the lateral hypothalamus in the brain. (sciencenews.org)
The placenta secretes a large amount of corticotrophin - releasing hormone (a stress reducing hormone) in the third trimester, and may trigger the hypothalamus in the brain, which normally secretes the hormone, to stop producing it. (babydickey.com)
In the normal response to a stressful situation, the hypothalamus in the brain sends corticotropin - releasing hormone (CRH) to the pituitary gland, which releases adrenocorticotropic hormone (ACTH) to the adrenal gland. (scientificamerican.com)