A transverse section of the adult spinal cord shows white matter in the periphery, gray matter inside, and a tiny central canal filled with CSF at its center. Surrounding the canal is a single layer of cells, the ependymal layer.
Cortisol is commonly referred to as the stress hormone.. The hormone is secreted by the adrenal glands and released into the bloodstream as a fight or flight response to stress. The highest quantities of cortisol are produced in the early morning hours and then production slowly tapers off throughout the day.
The Adrenal Medulla. Introduction. Induction of cortisol production requires several minutes, and full elaboration of. cortisol action requires several hours. In contrast, the adrenal medullary hormones. are intended for much more rapid responses, and are primary mediators of the. âfight or flightâ response.