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HESI A2 Anatomy & Physiology Subject Dominance Guide Overview

The HESI A2 Anatomy & Physiology (A&P) subtest evaluates fundamental biological concepts, organ system structure, tissue histology, and physiological homeostasis required for nursing school entry. The subtest features 25 to 30 operational questions designed to assess student mastery across 11 core body systems: Cardiovascular (blood flow pathways, cardiac cycle, conduction system), Endocrine (hormone regulation, pituitary/adrenal feedback loops), Nervous (central vs. peripheral nervous system, neuron transmission, action potentials), Skeletal (axial vs. appendicular skeleton, bone histology, ossification), Muscular (sliding filament theory, muscle contraction types), Respiratory (gas exchange mechanics, lung volumes), Digestive (enzymatic breakdown, nutrient absorption), Renal/Urinary (nephron filtration, electrolyte balance), Reproductive, Lymphatic/Immune, and Integumentary (skin layers, thermoregulation).

HESI A2 Core Specialty · 25–30 High-Yield Questions

HESI A2 Anatomy & Physiology
Subject Dominance Guide

Master anatomical directionality, histological tissues, cellular organelles, and all 11 major organ systems with our medical-grade HESI A2 preparation blueprint.

Cardiovascular & Blood Endocrine Feedback Nervous Architecture Renal & Nephron Function
HESI Subtest Specs A&P Module
25–30 Items

Focus: Direct Recall & Systems Knowledge

25 Minutes

Recommended Time Allocation

80%+ Target

Minimum Nursing Benchmark

Review Body Systems →

HESI A&P Dominance Index

1. Terminology & Planes 2. Histology & Tissues 3. Cardiovascular & Blood 4. Endocrine System 5. Nervous System 6. Remaining Organ Systems 7. Worked Exam Scenarios 8. Candidate FAQs
Foundational Anatomy

1. Anatomical Position, Planes & Directional Terms

Questions regarding directional orientation and anatomical planes appear frequently on the HESI A2 exam. All directional terms assume the body is in the standard anatomical position: standing erect, facing forward, arms at sides with palms facing forward.

Directional Term Anatomical Meaning High-Yield HESI Example
Superior (Cranial) vs. Inferior (Caudal) Toward the head/upper body vs. toward the feet/lower body. The heart is superior to the diaphragm.
Anterior (Ventral) vs. Posterior (Dorsal) Toward the front of the body vs. toward the back of the body. The sternum is anterior to the spine.
Medial vs. Lateral Toward the midline of the body vs. away from the midline. The nose is medial to the eyes.
Proximal vs. Distal Closer to the point of attachment/origin vs. farther away (used for limbs). The elbow is proximal to the wrist.
Superficial vs. Deep Toward the body surface vs. away from the surface (internal). The skin is superficial to skeletal muscle.
Sagittal Plane

Divides the body vertically into right and left sections. A midsagittal plane cuts directly down the midline into equal halves.

Frontal (Coronal) Plane

Divides the body vertically into anterior (front) and posterior (back) portions.

Transverse (Horizontal) Plane

Divides the body horizontally into superior (upper) and inferior (lower) portions.

Microscopic Anatomy

2. Histology & Four Primary Tissue Classes

Histology questions test your ability to classify tissue types based on structure, location, and physiological function:

1. Epithelial Tissue

Covers body surfaces, lines internal cavities and organs, and forms glands. Avascular (lacks direct blood supply). Classified by cell shape and layer count:

  • Simple Squamous: Single flat layer; optimized for rapid diffusion (e.g., alveoli of lungs, capillaries).
  • Stratified Squamous: Multiple flat layers; provides protection against abrasion (e.g., skin epidermis, esophagus).
  • Simple Columnar: Tall cells; optimized for absorption and secretion (e.g., digestive tract lining).

2. Connective Tissue

Most abundant tissue type in the body. Connects, supports, binds, and protects other organs. Characterized by cells suspended within an extracellular matrix.

  • Types: Bone (osseous), cartilage, adipose (fat), dense fibrous (tendons/ligaments), and blood (vascular tissue).

3. Muscle Tissue

Specialized for contraction and force generation. Three distinct types:

  • Skeletal Muscle: Striated, multinucleated, voluntary control.
  • Cardiac Muscle: Striated, branching cells, intercalated discs, involuntary control.
  • Smooth Muscle: Non-striated, spindle-shaped, involuntary control (e.g., blood vessels, stomach).

4. Nervous Tissue

Composed of neurons (conduct electrochemical electrical impulses) and neuroglia (supporting glial cells that protect and nourish neurons). Located in brain, spinal cord, and nerves.

High-Yield Organ System

3. Cardiovascular System & Hemodynamics

The cardiovascular system is consistently the most heavily tested domain on the HESI A2 A&P subtest.

Pathway of Blood Through the Heart

  1. Deoxygenated blood enters Right Atrium via Superior/Inferior Vena Cava.
  2. Passes through Tricuspid Valve into Right Ventricle.
  3. Pumped through Pulmonary Semilunar Valve into Pulmonary Artery to lungs.
  4. Oxygenated blood returns via Pulmonary Veins into Left Atrium.
  5. Passes through Bicuspid (Mitral) Valve into Left Ventricle (thickest chamber).
  6. Pumped through Aortic Semilunar Valve into Aorta for systemic circulation.

Cardiac Conduction Sequence

  1. Sinoatrial (SA) Node: The primary pacemaker of the heart (~70–80 bpm) located in right atrium.
  2. Atrioventricular (AV) Node: Delays impulse briefly to allow ventricular filling.
  3. Bundle of His (AV Bundle): Transmits impulse down interventricular septum.
  4. Right & Left Bundle Branches: Direct signal toward cardiac apex.
  5. Purkinje Fibers: Distribute action potential throughout ventricular myocardium.
High-Yield Organ System

4. Endocrine Glands & Hormone Regulation

Endocrine questions test hormone sources, target organs, and feedback mechanisms:

Pituitary Gland ("Master Gland")
  • Anterior Pituitary: Secretes TSH, ACTH, FSH, LH, GH, and Prolactin.
  • Posterior Pituitary: Stores and releases Oxytocin (uterine contractions) and ADH / Vasopressin (water reabsorption in kidney).
Thyroid & Parathyroid
  • Thyroid ($T_3/T_4$): Regulates basal metabolic rate. Secretes Calcitonin (lowers blood calcium by storing it in bone).
  • Parathyroid (PTH): Raises blood calcium by stimulating osteoclasts to break down bone.
Pancreas & Adrenals
  • Pancreas: Beta cells produce Insulin (lowers blood glucose); Alpha cells produce Glucagon (raises blood glucose).
  • Adrenal Cortex: Cortisol (stress) and Aldosterone (sodium reabsorption).
High-Yield Organ System

5. Nervous System Architecture

Autonomic Nervous System (ANS)

  • Sympathetic Nervous System ("Fight or Flight"): Increases heart rate, dilates bronchioles, dilates pupils, inhibits digestion and salivation.
  • Parasympathetic Nervous System ("Rest and Digest"): Decreases heart rate, constricts bronchioles, stimulates digestion and peristalsis.

Brain Structures

  • Cerebrum: Largest part; higher thinking, sensory perception, voluntary motor control.
  • Cerebellum: Coordinates muscle movement, balance, and posture.
  • Brainstem (Medulla Oblongata): Controls vital autonomic functions (heart rate, respiration, blood pressure, swallowing).
Comprehensive Coverage

6. Skeletal, Muscular, Respiratory & Renal Systems

Skeletal System

206 bones. Axial: Skull, vertebral column, ribcage. Appendicular: Limbs and girdles. Osteoblasts build bone; Osteoclasts break down bone.

Respiratory System

Inhalation: Diaphragm contracts and moves downward; intercostal muscles expand chest cavity, creating negative pressure.

Renal System

Functional unit is the Nephron. Glomerular filtration → Tubular reabsorption → Tubular secretion → Urine excretion.

Digestive System

Small Intestine (Duodenum, Jejunum, Ileum) is the primary site of nutrient absorption. Stomach produces HCl and Pepsinogen.

Exam Simulation

7. Worked HESI A2 A&P Practice Questions

Category: Cardiovascular Physiology HESI Practice Item 1

Question: Which heart chamber has the thickest muscular wall due to the high pressure required to pump blood throughout the entire systemic circulation?

A) Right Atrium
B) Right Ventricle
C) Left Ventricle ✓
D) Left Atrium
Anatomical Rationale:

Correct Answer: C. The Left Ventricle must generate enough contractile force to propel blood through the high-resistance systemic circulatory system via the aorta. Consequently, its myocardium is significantly thicker than that of the right ventricle (which only pumps to the low-resistance pulmonary circuit).

Category: Endocrine Regulation HESI Practice Item 2

Question: Which hormone, secreted by the parathyroid glands, acts to increase blood calcium levels when hypocalcemia is detected?

A) Parathyroid Hormone (PTH) ✓
B) Calcitonin
C) Aldosterone
D) Thyroxine ($T_4$)
Physiological Rationale:

Correct Answer: A. Parathyroid Hormone (PTH) elevates serum calcium levels by stimulating osteoclast activity (degrading bone matrix to release calcium), increasing intestinal calcium absorption, and promoting renal calcium reabsorption. Calcitonin (Option B) exerts the opposite antagonist effect by lowering blood calcium.

Frequently Asked Questions

8. Candidate HESI A&P FAQs

How hard is the HESI A2 Anatomy & Physiology section?

Most students find the HESI A2 A&P section manageable if they have completed a college-level A&P course. Unlike the TEAS, which includes chemistry and general science in one block, the HESI A2 tests A&P as a distinct module with straightforward direct-knowledge questions.

What score do nursing schools require on HESI A2 A&P?

Most nursing programs set a minimum passing score of 75% to 80% on the A&P subtest, with competitive programs favoring scores of 88% or higher.

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