The endocrine and nervous systems

Discuss the intricate relationship between the endocrine and nervous systems in regulating physiological processes such as stress response and metabolism. Include an analysis of the hypothalamic-pituitary-adrenal (HPA) axis, detailing the release of corticotropin-releasing hormone (CRH), adrenocorticotropic hormone (ACTH), and cortisol, and elucidate how neural signals from the brain can influence hormone secretion and vice versa.