Psychoneuroimmunology examines how which systems interact?

• A. It studies nutrition
• B. It studies how psychological processes, the nervous system, and the immune system interact
• C. It studies pharmacology of immune therapies
• D. It studies exercise physiology

Answer: (B)

Psychoneuroimmunology examines how our psychological processes, the nervous system, and the immune system interact and influence one another. It looks at how thoughts, emotions, and stress affect brain and hormonal pathways, which then modulate immune cell activity and cytokine signaling. For example, stress can activate the hypothalamic-pituitary-adrenal axis, releasing cortisol that can dampen or alter immune responses, while immune signals like cytokines can impact mood, sleep, and behavior. This bidirectional communication helps explain how mental states can affect susceptibility to illness and how immune activity can influence mental and emotional experiences. While nutrition, drugs, or exercise can shape immune function, the defining focus here is the interaction among psychological processes, the nervous system, and the immune system.