UNIT 13 PSYCHOSOCIAL NEEDS C. Stress and Adaptation-Introductory concepts. Stress and Adaptation. Stress and adaptation are critical concepts in nursing, as they influence patient health, disease progression, and overall well-being. Understanding these concepts helps nurses provide better care by recognizing stressors, assessing coping mechanisms, and implementing interventions. 1. Definition of Stress Stress is the body’s response to any demand or challenge (stressor), whether physical, psychological, or environmental. It disrupts homeostasis