Stress and Adaptation

Objectives

When you have completed this section, you should be able to

• give a physiological definition of stress; and

• discuss how the body adapts to stress through its endocrine system.

Stress affects us all from time to time, and we react to it in ways that are mediated mainly by the endocrine and sympathetic nervous systems. Stress is defined as any situation that upsets homeostasis and threatens one's physical or emotional well-being. Physical causes of stress (stressors) include injury, surgery, hemorrhage, infection,

Saladin: Anatomy & 17. The Endocrine System Text © The McGraw-Hill

Physiology: The Unity of Companies, 2003 Form and Function, Third Edition

Chapter 17 The Endocrine System 663

Up-regulation

Hormone

Receptor-

Low receptor density Weak response

Response

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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