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The TEAS 7 Science section is where most nursing students stumble. Thirty-nine percent of your overall TEAS score comes from this one section more than any other. You’re tested on anatomy, physiology, biology, chemistry, and scientific reasoning, all within 60 minutes. Miss too many science questions and even perfect scores in other sections won’t save your composite score.

Here’s what separates students who pass from those who retake: strategic preparation. The science section isn’t designed to test whether you memorized every body system or chemical formula. It tests whether you can recognize high-yield patterns, apply basic scientific principles, and make clinical connections under time pressure. 

Students who understand this distinction and prepare accordingly using resources like Testavia’s targeted TEAS practice questions consistently score higher than those who try to memorize entire textbooks. This guide shows you exactly what’s tested which topics matter most and how to study efficiently so you pass on your first attempt.

What’s Actually on the TEAS 7 Science Section

You get 50 questions in 60 minutes. That’s roughly 72 seconds per question and not much time when you’re recalling anatomical pathways or balancing chemical equations. The breakdown matters because not all topics are weighted equally.

According to ATI’s official TEAS exam science content breakdown, here’s how the 50 questions distribute across science topics:

• Human Anatomy and Physiology: 20 questions (41% of scored questions) This is the single largest category. You need to know 10 body systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic/immune, respiratory, digestive, and urinary/excretory. Most questions ask you to identify structures, explain functions or trace physiological pathways.
• Biology: 9 questions (18% of scored questions) Cell structure and function, macromolecules, cellular reproduction (mitosis and meiosis), genetics and DNA, and a bit of evolution. Biology questions often show diagrams you’ll need to identify organelles or interpret genetic crosses.
• Chemistry: 8 questions (16% of scored questions) Atomic structure, chemical bonds, chemical reactions, states of matter, acids and bases, and biochemistry basics. Chemistry is where students with weak math skills struggle because you’re doing metric conversions and balancing equations.
• Scientific Reasoning: 7 questions (14% of scored questions) Reading and interpreting scientific data from graphs, charts, and experiments. Understanding the scientific method, identifying variables, and drawing conclusions from evidence. These questions don’t require memorization; they test critical thinking.

The remaining questions are unscored pretest items ATI uses to test future questions. You won’t know which ones are pretest, so treat every question like it counts.

Why this breakdown matters: if you spend equal time on all topics, you’re wasting effort. Anatomy and physiology is 41% of your score. That’s where your focus belongs.

Anatomy and Physiology: The Make-or-Break Category

Twenty questions out of fifty. Get 15 right and you’re in good shape. Miss 10 and you’re retaking the exam. Most students underestimate how detailed A&P questions get.

The 10 Body Systems You Must Know

Integumentary System (Skin)

Layers of skin (epidermis, dermis, hypodermis), functions (protection, temperature regulation, sensation), and structures like hair follicles and sweat glands. Questions might ask what happens when skin is damaged or which layer contains melanocytes.

Skeletal System

Bone structure (compact vs. spongy bone), major bones (femur, humerus, skull, vertebrae), bone functions (support, protection, blood cell production), and joint types (ball-and-socket, hinge, pivot). You don’t need to memorize every tiny bone, but you should know major ones and their locations.

Muscular System

Types of muscle tissue (skeletal, smooth, cardiac), muscle function (movement, posture, heat production), and how muscles contract (actin-myosin interaction, though not in extreme detail). Questions often compare muscle types or ask which muscles are voluntary vs. involuntary.

Nervous System

Central nervous system (brain and spinal cord) vs. peripheral nervous system. Neuron structure (dendrites, axon, myelin sheath), how nerve impulses travel, and basic brain anatomy (cerebrum, cerebellum, brainstem). Expect questions on reflex arcs or neurotransmitter function.

Endocrine System

Major glands (pituitary, thyroid, adrenal, pancreas) and their hormones. What insulin does, what thyroid hormone regulates, what happens when hormone levels are too high or too low. This system connects to many clinical scenarios in nursing, so questions are practical.

Circulatory System (Cardiovascular)

Heart anatomy (four chambers, valves), blood flow pathway (right atrium → right ventricle → lungs → left atrium → left ventricle → body), blood vessels (arteries, veins, capillaries), and blood components (red blood cells, white blood cells, platelets, plasma). This is heavily tested. You must know the pathway of blood through the heart and lungs.

Lymphatic and Immune System

Lymph nodes, spleen, thymus, and how the immune system fights infection. Difference between innate immunity (barriers like skin) and adaptive immunity (antibodies). Questions ask about immune responses or what happens when the immune system fails.

Respiratory System

Structures (nasal cavity, trachea, bronchi, lungs, alveoli), gas exchange (oxygen in, carbon dioxide out), and how breathing works (diaphragm contracts, lungs expand). You’ll get questions on what happens during inhalation vs. exhalation or where gas exchange occurs (alveoli).

Digestive System

Path of food (mouth → esophagus → stomach → small intestine → large intestine → rectum), what each organ does (stomach breaks down protein, small intestine absorbs nutrients), and accessory organs (liver, pancreas, gallbladder). Expect questions on enzyme function or nutrient absorption.

Urinary/Excretory System

Kidneys filter blood, produce urine. Ureters carry urine to bladder, urethra eliminates it. Nephron structure and function (filtration, reabsorption, secretion). Questions ask what kidneys remove from blood or what happens if kidneys fail.

How A&P Questions Are Asked

You won’t get simple recall questions like “What does the heart do?” Instead, you’ll see:

• Pathway questions: “Trace the flow of blood from the right ventricle to the left atrium.”
• Function questions: “Which organ system regulates calcium levels in the blood?” (Answer: endocrine, via parathyroid hormone)
• Diagram identification: A picture of the heart with arrows; you identify which chamber blood enters first.
• Clinical application: “A patient has low red blood cell count. Which organ is likely affected?” (Answer: bone marrow, where RBCs are made)

This is why memorizing definitions doesn’t work. You need to understand how systems function and interact.

Study Strategies for A&P

1. Draw everything. Seriously. Draw the heart and label all four chambers, valves, and major vessels. Draw the digestive tract. Sketch a neuron. Your brain retains visual-spatial information better than text. If you can’t draw it from memory, you don’t know it well enough.
2. Use mnemonics. “On Old Olympus’ Towering Tops, A Finn And German Viewed Some Hops” = cranial nerves (Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Auditory/Vestibulocochlear, Glossopharyngeal, Vagus, Spinal Accessory, Hypoglossal). Make up your own or use established ones.
3. Focus on pathways and processes, not isolated facts. How does blood flow through the heart? What happens when you inhale? How does food move through digestion? Connect the steps.
4. Practice identifying diagrams. Find unlabeled diagrams of body systems online and label them. Then check your answers. Repeat until automatic.

Biology: Cells, Genetics, and DNA

Nine questions total. Less than A&P, but still significant. Biology is where students who haven’t taken science courses in years struggle because it’s conceptual, not just memorization.

Cell Structure and Organelles

Know the function of: nucleus (contains DNA), mitochondria (produces energy/ATP), ribosomes (make proteins), endoplasmic reticulum (transports materials), Golgi apparatus (packages proteins), lysosomes (digest waste), cell membrane (controls what enters/exits), cell wall (plant cells only, provides structure).

Questions often show a diagram of a cell and ask “Which organelle produces energy?” or “What structure is found in plant cells but not animal cells?”

Macromolecules

Four types: carbohydrates (sugars, provide energy), lipids (fats, store energy and make cell membranes), proteins (made of amino acids, do most cellular work), and nucleic acids (DNA and RNA, store genetic information).

You’ll get questions like “Which macromolecule is the primary energy source?” (carbohydrates) or “What are proteins made of?” (amino acids).

Mitosis vs. Meiosis

This is always tested. Mitosis = cell division that produces two identical daughter cells (for growth and repair). Meiosis = cell division that produces four sex cells (sperm or egg) with half the chromosomes.

Key difference: mitosis keeps chromosome number the same; meiosis cuts it in half. Questions ask which type of division produces gametes or how many chromosomes are in daughter cells.

Genetics and DNA

DNA structure (double helix, made of nucleotides), base pairing (A pairs with T, G pairs with C), and basic inheritance (dominant vs. recessive alleles, Punnett squares).

You might see a Punnett square and be asked to determine the probability of offspring inheriting a trait. Or you’ll need to explain what happens if DNA replication goes wrong (mutations).

Study Strategies for Biology

1. Flashcards for organelles and macromolecules. Front: “What does the mitochondria do?” Back: “Produces ATP (energy).” Drill until automatic.
2. Draw and compare mitosis vs. meiosis side by side. Label how many cells result, how many chromosomes, what they’re used for. Visual comparison helps you remember differences.
3. Practice Punnett squares. Use online genetics problems. Work through 10-15 until you can predict offspring ratios without hesitation.
4. Use free video resources for visual learning. If cell biology and genetics concepts aren’t clicking from textbooks alone, Khan Academy’s biology section offers free video explanations with animations of cellular processes, mitosis/meiosis, and DNA replication. Watching these processes in motion, seeing how chromosomes separate during meiosis or how proteins are synthesized helps concepts stick better than static diagrams. The videos are short (5-10 minutes each) and you can watch at your own pace.

Chemistry: The Section Students Fear (But Shouldn’t)

Eight questions. Chemistry intimidates students, but TEAS chemistry is basic. You’re not doing organic chemistry or complex stoichiometry. You’re covering foundational concepts.

Atomic Structure

Atoms have protons (positive charge), neutrons (no charge), and electrons (negative charge). Protons + neutrons = atomic mass. Number of protons = atomic number. Questions ask “What determines an element’s identity?” (number of protons) or “Where are electrons located?” (electron cloud/orbitals).

Chemical Bonds

Ionic bonds = transfer of electrons (forms between metals and nonmetals). Covalent bonds = sharing of electrons (forms between nonmetals). Hydrogen bonds = weak attraction between molecules (important in water and DNA).

You’ll see questions like “What type of bond forms between sodium and chlorine?” (ionic, because sodium is a metal and chlorine is a nonmetal).

States of Matter

Solid (particles tightly packed), liquid (particles move freely but stay close), gas (particles spread out, fill container). Phase changes: melting (solid to liquid), freezing (liquid to solid), evaporation (liquid to gas), condensation (gas to liquid).

Questions ask what happens to particles when you heat a substance or which state has the most kinetic energy (gas).

Acids and Bases

pH scale: 0-6 is acidic, 7 is neutral, 8-14 is basic. Strong acids have low pH (stomach acid = ~2). Strong bases have high pH (bleach = ~13). Questions ask “What pH indicates a base?” or “Which substance is acidic?”

Metric Conversions

You must know: 1 kilogram = 1,000 grams. 1 liter = 1,000 milliliters. 1 meter = 100 centimeters. Converting units is essential for dosage calculations in nursing, so this shows up frequently.

Practice: “Convert 2.5 kg to grams.” Answer: 2,500 grams (multiply by 1,000).

Study Strategies for Chemistry

1. Memorize the pH scale. 0-6 = acid, 7 = neutral, 8-14 = base. Drill it.
2. Practice metric conversions daily. Do 5-10 conversion problems every day. Use flashcards or online quizzes. Speed matters.
3. Understand bonding types with examples. Ionic = NaCl (table salt). Covalent = H₂O (water). Hydrogen = between water molecules. Examples make it stick.

Scientific Reasoning: Critical Thinking Over Memorization

Seven questions that test your ability to read graphs, interpret data, and understand experimental design. You don’t need prior knowledge—you need logic.

Reading Graphs and Charts

Bar graphs, line graphs, pie charts, and tables. Questions ask “According to the graph, what happened between years 2 and 4?” or “Which variable increased the most?”

Practice reading the axes carefully. Identify trends (increasing, decreasing, stable). Don’t rush—one misread axis ruins your answer.

The Scientific Method

Steps: observation → question → hypothesis → experiment → analysis → conclusion. Questions ask “What is the independent variable?” (the thing you change) or “What is a control group?” (the group that doesn’t get the treatment, used for comparison).

Example: Testing if a new drug lowers blood pressure. Independent variable = drug (you control who gets it). Dependent variable = blood pressure (what you measure). Control group = patients who get a placebo.

Drawing Conclusions from Data

Given experimental results, you determine what the data supports. “Based on the data, which statement is true?” You eliminate answers contradicted by evidence and choose the one the data actually supports.

Don’t bring in outside knowledge. Base your answer only on the information provided.

Study Strategies for Scientific Reasoning

1. Practice reading scientific passages and graphs. Find practice questions that show data tables or experimental setups. Work through 10-15.
2. Learn to identify variables quickly. Independent = what you change. Dependent = what you measure. Constant = what stays the same. Control = baseline for comparison.
3. Don’t overthink. Scientific reasoning questions are straightforward if you read carefully. Eliminate wrong answers methodically.

Common Mistakes That Cost Students Points

• Spending equal time on all topics. A&P is 41% of your score. If you split your time evenly across all categories, you’re under-preparing for the section that matters most. Spend 50% of your science study time on anatomy and physiology.
• Memorizing without understanding. Knowing that mitochondria produce ATP is useless if you don’t understand why cells need energy or what happens when mitochondria malfunction. TEAS questions test application, not recall.
• Ignoring diagrams. Many questions include images—heart diagrams, cell structures, graphs. If you only study text, you’ll struggle. Practice identifying labeled and unlabeled diagrams.
• Skipping metric conversions. “It’s just math” is the excuse students use before missing easy points. Metric conversions are free points if you practice. Don’t skip them.
• Rushing through scientific reasoning. These questions require careful reading. Students rush, misread the graph axis and pick the wrong answer. Slow down.

Two-Week Science Study Plan

Week 2 Before Test:

Focus on anatomy and physiology. Study 2 body systems per day (Day 1: integumentary + skeletal, Day 2: muscular + nervous, etc.). Draw each system from memory. Label structures. Review functions.

Practice 20 A&P questions daily. Review wrong answers. Identify patterns in mistakes.

Week 1 Before Test:

Review biology (cells, genetics, mitosis/meiosis). Do 15 biology questions. Focus on weak areas.

Review chemistry (atomic structure, bonds, pH, metric conversions). Practice 10 conversion problems. Do 15 chemistry questions.

Practice scientific reasoning with 10 graph/data questions daily.

48 Hours Before Test:

Take one full timed science section (50 questions, 60 minutes). Review mistakes thoroughly. Don’t cram new material.

Rest. Sleep matters. Your brain consolidates memory during sleep. Pulling an all-nighter will hurt your score.

Understanding how the TEAS compares to later nursing exams can help you see the bigger picture. Students often wonder whether TEAS preparation translates to NCLEX success—the answer is yes, because both exams test your ability to apply scientific knowledge in clinical contexts. If you’re curious about how these exams differ in difficulty and scope, check out our detailed breakdown comparing TEAS vs NCLEX difficulty and content overlap.

What Makes Testavia’s Science Prep Different

Most TEAS prep just throws practice questions at you. Testavia identifies your weak areas and focuses your study time where it matters most. Our science questions mirror real TEAS questions and not generic science trivia. You practice identifying diagrams, tracing physiological pathways, and applying concepts under timed conditions.

We built our platform around one truth: students don’t fail because they’re not smart enough. They fail because they study inefficiently. High-yield topics. Realistic questions. Immediate feedback. That’s how you pass.

Final Thoughts

The TEAS 7 Science section is the heaviest weighted section on the exam. Forty-one percent of your score comes from anatomy and physiology alone. But it’s not about memorizing every fact in a textbook. It’s about understanding high-yield systems, recognizing patterns, and applying basic principles.

Focus your effort where the points are. Master the 10 body systems. Understand cell biology and genetics. Learn basic chemistry concepts. Practice reading scientific data. Do this consistently for two weeks and you’ll walk into that test center confident.

Science is learnable. The students who pass aren’t necessarily the ones who took AP Biology in high school. They’re the ones who studied strategically, practiced deliberately, and showed up prepared.

You can be one of them.