Why the A&P Section Matters
The Anatomy & Physiology section of the HESI A2 is required by many nursing programs, and it is consistently rated as one of the most challenging sections by test-takers. Unlike Reading or Grammar — where you can rely on general knowledge and test-taking strategies — A&P requires specific content knowledge about body systems, organ functions, and physiological processes.
The good news: if you have completed (or are currently enrolled in) a college-level Anatomy & Physiology course, you already have most of the knowledge you need. The HESI A2 A&P section tests introductory-level concepts, not advanced clinical knowledge. The challenge is reviewing and retaining a large volume of material efficiently.
What Topics Are Tested
The HESI A2 A&P section covers the major human body systems. Based on published exam blueprints and student reports, the most frequently tested topics include:
Skeletal system: Bone types, bone structure, major bones, joints, and the functions of the skeletal system (support, protection, movement, mineral storage, blood cell production).
Muscular system: Muscle types (skeletal, smooth, cardiac), muscle contraction mechanism, major muscle groups, and the relationship between the muscular and skeletal systems.
Cardiovascular system: Heart anatomy (chambers, valves, major vessels), blood flow pathway, cardiac cycle, blood pressure, and blood components (red blood cells, white blood cells, platelets, plasma).
Respiratory system: Anatomy of the respiratory tract, gas exchange in the alveoli, the role of the diaphragm, oxygen and carbon dioxide transport, and the mechanics of breathing.
Digestive system: Organs of the GI tract and their functions, accessory organs (liver, pancreas, gallbladder), nutrient absorption, and the role of enzymes in digestion.
Nervous system: Central vs peripheral nervous system, neuron structure, nerve impulse transmission, brain regions and their functions, and the autonomic nervous system (sympathetic vs parasympathetic).
Endocrine system: Major glands (pituitary, thyroid, adrenals, pancreas), hormones and their target organs, feedback mechanisms, and the relationship between the endocrine and nervous systems.
Urinary system: Kidney structure, nephron function, urine formation, fluid and electrolyte balance, and the role of the kidneys in blood pressure regulation.
Reproductive system: Male and female anatomy, gamete production, menstrual cycle, and basic embryology.
Integumentary system: Skin layers (epidermis, dermis, hypodermis), skin functions, and accessory structures (hair, nails, sweat glands).
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How to Prioritize Your Study Time
Not all body systems appear with equal frequency on the HESI A2. Based on available data and student reports, the cardiovascular, respiratory, digestive, and nervous systems tend to receive the most questions. The skeletal and muscular systems also appear frequently. The endocrine, urinary, reproductive, and integumentary systems typically receive fewer questions but should not be skipped entirely.
A practical prioritization strategy: spend 60% of your A&P study time on the cardiovascular, respiratory, digestive, nervous, skeletal, and muscular systems. Spend the remaining 40% on the endocrine, urinary, reproductive, and integumentary systems. This ensures you cover the highest-yield topics thoroughly while still maintaining baseline knowledge across all systems.
Study Strategies That Work
Use your A&P textbook and notes. If you have completed or are currently taking A&P, your course materials are your single best resource. The HESI A2 tests introductory-level content — the same content covered in A&P I and A&P II. Review your notes, focus on diagrams you already have, and revisit chapters on the systems listed above.
Learn systems, not isolated facts. The HESI A2 often tests how systems relate to each other and how physiological processes work, not just anatomy identification. For example, you might need to understand how the respiratory and cardiovascular systems work together during gas exchange, or how the nervous and endocrine systems coordinate to regulate body functions. Study with "how does this work?" questions, not just "what is this called?" questions.
Focus on the pathway of blood through the heart. This is one of the most commonly tested topics on the HESI A2 A&P section. Know the path: vena cava, right atrium, right ventricle, pulmonary arteries, lungs, pulmonary veins, left atrium, left ventricle, aorta. Know which chambers contain oxygenated vs deoxygenated blood, and know the four heart valves.
Memorize key organ functions, not just locations. The HESI A2 is more likely to ask "What is the function of the gallbladder?" than "Where is the gallbladder located?" Focus on what each organ does, what it produces, and what system it belongs to.
Take a diagnostic first. Before spending weeks on A&P review, confirm that this section is actually your weakest area. If your Math or Reading scores are lower, those sections might deserve more of your study time. StudyBuddy offers a free diagnostic that breaks down your performance — use it to make sure your study plan is targeting the right areas.
Common Mistakes to Avoid
Studying too broadly. The HESI A2 tests introductory A&P, not advanced physiology. You do not need to know the Krebs cycle in detail or the names of every bone in the hand. Focus on major structures, primary functions, and how systems interact.
Neglecting physiology for anatomy. Students often focus heavily on memorizing structures and locations while neglecting how systems function. The HESI A2 tests both, with a slight emphasis on functional understanding. Make sure you can explain processes (digestion, gas exchange, nerve impulse transmission), not just label diagrams.
Skipping practice questions. Reading notes and textbooks is important, but active recall through practice questions is how you solidify knowledge. Do at least 15-20 A&P practice questions per study session. Review every wrong answer and understand why the correct answer is correct.
Cramming the night before. A&P is a content-heavy section that requires spaced repetition to retain. Studying a little every day for 2-3 weeks is far more effective than cramming for 8 hours the day before. Start your A&P review at least 2 weeks before your exam date.