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Related Concept Videos

Physiological Foundation of Stress01:24

Physiological Foundation of Stress

Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
Anatomy of the Adrenal Glands01:17

Anatomy of the Adrenal Glands

The adrenal or supra-renal glands, situated above the kidneys and aligned with the twelfth rib, are paired pyramid-shaped structures crucial for the body's stress response. During stress, these glands secrete hormones vital for adaptive physiological reactions.
These glands possess a distinctive yellow tinge due to the stored cholesterol and fatty acids required for hormone synthesis. They are encased in a fibrous capsule and cushioned by fat.
The adrenal gland comprises two distinct regions...
Hormones of the Adrenal Glands01:31

Hormones of the Adrenal Glands

Adrenal hormones play a pivotal role in maintaining the body's electrolyte balance and orchestrating responses to stress, showcasing the intricate functions of the adrenal cortex and medulla.
The adrenal cortex, a powerhouse of hormone synthesis, generates over two dozen corticosteroid hormones. The zona glomerulosa produces mineralocorticoids, exemplified by aldosterone, influencing the electrolyte composition of body fluids. The synthesis of glucocorticoids such as cortisol and corticosterone...
Stress Response System01:21

Stress Response System

The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
Alarm stage
In the alarm stage, the body's initial...
Introduction to Stress and Lifestyle01:27

Introduction to Stress and Lifestyle

Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...

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An Alternative to the Traditional Cold Pressor Test: The Cold Pressor Arm Wrap
09:16

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Published on: January 16, 2014

Adrenal responses to stress.

David S Goldstein1

  • 1Clinical Neurocardiology Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Building 10, Room 5N220, 9000 Rockville Pike, 10 Center Drive, MSC-1620, Bethesda, MD 20892-1620, USA. goldsteind@ninds.nih.gov

Cellular and Molecular Neurobiology
|November 10, 2010
PubMed
Summary

Stress triggers adrenal responses via the sympathoadrenal system and hypothalamic–pituitary–adrenocortical (HPA) axis. Prolonged stress can lead to disorders, with adrenomedullary activity linked more to adrenocortical than sympathetic responses.

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Area of Science:

  • Neuroendocrinology
  • Stress Physiology

Background:

  • The stress response, involving the sympathoadrenal system and hypothalamic–pituitary–adrenocortical (HPA) axis, is crucial for maintaining homeostasis during emergencies.
  • While historically viewed as a unitary system, evidence suggests varied autonomic responses to different stressors.
  • Excessive or prolonged stress activation can precipitate clinical disorders.

Purpose of the Study:

  • To investigate the distinct patterns of autonomic responses to various stressors.
  • To clarify the relationship between sympathetic noradrenergic, adrenomedullary, and adrenocortical activities during stress.
  • To understand the neuroendocrine mechanisms underlying distress.

Main Methods:

  • The study likely involved analyzing physiological and hormonal data from subjects exposed to different types of stressors.
  • Measurements may have included markers of sympathetic noradrenergic activity, adrenomedullary output (e.g., catecholamines), and HPA axis activation (e.g., cortisol).

Main Results:

  • Different stressors elicit distinct patterns of autonomic and neuroendocrine responses.
  • Adrenomedullary hormonal activity is more closely associated with adrenocortical responses than with sympathetic noradrenergic responses.
  • Distress is characterized by the concurrent activation of both the HPA axis and adrenomedullary neuroendocrine systems.

Conclusions:

  • The concept of a unitary sympathoadrenal system is insufficient to explain the nuanced stress response.
  • Stress response pathways are more complex, with specific interactions between the HPA axis and adrenomedullary system.
  • Understanding these distinct pathways is critical for comprehending stress-related disorders.