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Stress is often defined as the internal or external demands placed on a person, triggering physical reactions that are part of an organized, adaptive response to those demands. The magnitude of perceived stress depends largely on the extent to which the event is appraised as controllable and the amount of coping resources available to manage the event or the emotional reaction to the event.

The immune system plays a fundamental role in protecting the body from foreign agents and from uncontrolled growth of normal cells, in regulating allergic responses, and in promoting wound healing. The immune system comprises different types of cells that are specialized to defend against specific types of threats to health. Through neural and hormonal pathways, stress can alter the function of ...

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