The definition of HPA refers to the hypothalamic–pituitary–adrenal axis, a major neuroendocrine system that controls the body’s response to stress and helps maintain internal balance. According to the definition of HPA, this axis involves communication between the hypothalamus and pituitary gland in the brain and the adrenal glands located above the kidneys. When a person experiences ... https://www.yogkulam.org/blog/what-is-the-hypothalamic-pituitary-adrenal-hpa-axis