Homeostasis

Definition

Homeostasis is the physiologic process by which the body maintains a relatively stable internal environment despite external changes, such as feedback mechanisms regulate temperature, pH, blood glucose, fluid and electrolyte balance, blood pressure, and more.

Mechanisms

• Negative feedback (most common): Output reverses the change (glucose → insulin → glucose falls).
• Positive feedback: Output amplifies the change (oxytocin during labor, clotting cascade).

Components

Receptor (detects change) → control center (integrates signal) → effector (produces response).

Clinical Significance

Many pathologies represent failure of homeostasis, such as hyperglycemia (diabetes), dehydration, acidosis, hypoxia. Restoration of homeostasis is a core nursing goal.

NCLEX Relevance

Conceptual framework for understanding physiologic disruption and nursing interventions.