Physio 19: The Adrenal Medulla & Adrenal Cortex

The adrenal glands sit atop the kidneys like quiet sentinels, yet they govern some of the body’s most powerful responses to stress. What makes them unique is not just what they secrete—but how differently their two regions operate.In this episode, Medlock Holmes explores the adrenal medulla and adrenal cortex as distinct but coordinated systems. We examine catecholamine release for immediate response, steroid hormone synthesis for sustained adaptation, and how neural and endocrine control converge within a single organ.This episode reframes stress physiology as a two-speed system—one designed for rapid survival, the other for longer-term recalibration.Here, physiology teaches that adaptation is not a single response.It is a layered strategy.Key Takeaways* The adrenal medulla mediates rapid stress responses via catecholamines* The adrenal cortex supports long-term adaptation through steroid hormones* Neural and endocrine control coexist within the adrenal gland* Stress responses involve both immediacy and endurance* Dysregulation reflects imbalance between speed and sustainability This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe