Category:Anatomy and Physiology

Anatomy and Physiology is the foundational science subject of nursing education. Anatomy describes the structures of the human body and how they are arranged; physiology explains how those structures function, both individually and as integrated systems. Together they answer the two questions that sit underneath every nursing intervention: what is normally there, and what is it normally doing?

This subject covers cellular and tissue organization, homeostasis and negative feedback, and each of the major body systems: integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, hematologic and immune, respiratory, gastrointestinal, renal and urinary, fluid and electrolyte and acid-base balance, and reproductive. It also covers the physiologic changes of aging and pregnancy, since both alter what counts as a normal finding.

For nursing practice, anatomy and physiology is not background reading. It is the reasoning engine behind assessment and prioritization. A nurse who understands that the left ventricle pumps into systemic circulation can predict that left-sided heart failure backs blood up into the lungs and produces crackles, dyspnea, and pink frothy sputum, while right-sided failure backs blood up into the venous system and produces jugular venous distention, peripheral edema, and hepatomegaly. A nurse who understands that the kidney regulates potassium can anticipate hyperkalemia in acute kidney injury and know to watch the cardiac monitor. Pathophysiology, pharmacology, and every clinical specialty are built directly on this material.

On the NCLEX-RN and NCLEX-PN, anatomy and physiology is rarely tested as pure recall. It appears embedded inside Physiological Adaptation, Reduction of Risk Potential, and Basic Care and Comfort items, where the candidate must use normal structure and function to interpret an assessment finding, recognize a complication, or decide which patient to see first. Registered nurse candidates are asked to apply this reasoning to multi-step clinical judgment, prioritization, and delegation; practical and vocational nurse candidates are asked to apply it to focused data collection, recognition of expected versus unexpected findings, and timely reporting to the registered nurse.