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.
Cortisol. Your adrenal glands secrete cortisol, which is often referred to as the stress hormone. Cortisol is part of the fight-or-flight response, which is a physiological reaction triggered in times of stress or when the body perceives danger.