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‘… almost all aspects of behaviour can be fully understood in terms of the concept of homeostasis.’

Curt Richter (1967)

Outline

In this chapter, we outline three interacting biological systems with a primary role in the regulation of health and illness: the nervous system, endocrine system and immune system. These three systems together control and coordinate the body’s responses to changes in the internal and external environment. We outline each system in turn and examine interactions between the nervous system, endocrine system and immune system with examples of recent research on psychoneuroimmunology. We conclude with a description of two kinds of homeostasis, both physiological and psychological.