TEAS Science Section: The Ultimate Study Guide for 2026

The Science section of the ATI TEAS exam is often considered the most challenging part of the test. With 50 questions covering human anatomy and physiology, biology, chemistry, and scientific reasoning, it requires a broad knowledge base and solid understanding of scientific concepts. But don't worry—with the right study approach, you can conquer this section and boost your overall TEAS score.

TEAS Science Section Breakdown

Before diving into study strategies, let's understand exactly what you're facing. The TEAS 7 Science section includes 50 questions that must be completed in 60 minutes. Here's how the questions are distributed:

• Human Anatomy and Physiology: ~32 questions (64%)
• Biology: ~8 questions (16%)
• Chemistry: ~8 questions (16%)
• Scientific Reasoning: ~2 questions (4%)

Human Anatomy and Physiology: High-Yield Topics

Since anatomy and physiology dominate the Science section, mastering these body systems is crucial for TEAS success:

Cardiovascular System

• Heart anatomy: 4 chambers, valves, and blood flow pathway
• Blood vessels: arteries carry oxygenated blood away, veins carry deoxygenated blood toward the heart
• Blood components: red blood cells, white blood cells, platelets, plasma
• Cardiac cycle and electrical conduction (SA node, AV node)
• Blood pressure and pulse concepts

Respiratory System

• Upper and lower respiratory tract structures
• Gas exchange in alveoli (oxygen and carbon dioxide)
• Mechanics of breathing: diaphragm contraction and relaxation
• Lung volumes and capacities
• Relationship between respiratory and cardiovascular systems

Digestive System

• Path of food: mouth → esophagus → stomach → small intestine → large intestine
• Digestive enzymes and their functions (amylase, pepsin, lipase)
• Nutrient absorption in the small intestine (villi)
• Role of liver, gallbladder, and pancreas
• Mechanical vs. chemical digestion

Nervous System

• Central nervous system (brain and spinal cord) vs. peripheral nervous system
• Neuron structure: dendrites, cell body, axon, synapses
• Neurotransmitters and nerve impulse transmission
• Sympathetic (fight or flight) vs. parasympathetic (rest and digest)
• Brain regions and their functions

Musculoskeletal System

• Types of muscle: skeletal, cardiac, smooth
• Bone structure and types (long, short, flat, irregular)
• Major bones and their locations
• Joints and types of movement
• Muscle contraction mechanism basics

Urinary System

• Kidney structure: nephron, glomerulus, tubules
• Urine formation: filtration, reabsorption, secretion
• Role in maintaining homeostasis
• Fluid and electrolyte balance
• Path of urine: kidneys → ureters → bladder → urethra

Biology Essentials for TEAS

The biology questions on the TEAS focus on cellular and molecular concepts. Here's what to study:

Cell Structure and Function

• Cell membrane: phospholipid bilayer, selective permeability
• Organelles and their functions (mitochondria, ribosomes, nucleus, etc.)
• Prokaryotic vs. eukaryotic cells
• Cell transport: diffusion, osmosis, active transport
• ATP and cellular energy

Genetics and DNA

• DNA structure: double helix, nucleotides (A-T, G-C base pairing)
• DNA replication basics
• Transcription and translation (protein synthesis)
• Dominant vs. recessive alleles
• Punnett squares for inheritance patterns

Cell Division

• Mitosis: produces identical diploid cells for growth and repair
• Meiosis: produces haploid gametes for reproduction
• Phases of cell division
• Chromosomes and chromatids

Chemistry Fundamentals for TEAS

Don't panic about chemistry—the TEAS tests basic concepts that you can master with focused study:

Atomic Structure

• Protons, neutrons, electrons and their locations
• Atomic number vs. mass number
• Reading the periodic table
• Ions: cations (positive) and anions (negative)
• Isotopes and their significance

Chemical Bonds and Reactions

• Ionic bonds: transfer of electrons between metals and nonmetals
• Covalent bonds: sharing of electrons between nonmetals
• Balancing simple chemical equations
• Types of reactions: synthesis, decomposition, combustion
• Catalysts and enzymes

Acids, Bases, and pH

• pH scale: 0-14, with 7 being neutral
• Acids: pH below 7, release H+ ions
• Bases: pH above 7, release OH- ions
• Buffer systems in the body
• Common examples of acids and bases

States of Matter and Solutions

• Solid, liquid, gas properties
• Phase changes and energy
• Solutions: solute and solvent
• Concentration and dilution
• Molarity basics

Scientific Reasoning Questions

Scientific reasoning questions test your ability to think like a scientist. They typically involve:

• Understanding the scientific method steps
• Identifying independent, dependent, and control variables
• Interpreting data from graphs, charts, and tables
• Drawing conclusions from experimental results
• Recognizing valid vs. invalid experimental designs

Study Strategies for TEAS Science Success

Now that you know what to study, here's how to study effectively:

1. Use Active Learning Techniques

Passive reading won't cut it for science. Instead, actively engage with the material by creating diagrams of body systems, teaching concepts to others, and testing yourself frequently with practice questions.

2. Study in Chunks

Don't try to learn all body systems in one sitting. Focus on one system per study session, and review previously learned material before adding new content. This spaced repetition approach improves long-term retention.

3. Connect Concepts

Body systems don't work in isolation—they're interconnected. Understanding how the cardiovascular system delivers oxygen absorbed by the respiratory system, which is then used by cells for metabolism, creates a deeper understanding that helps you answer complex questions.

4. Practice with Realistic Questions

The best way to prepare is to practice with questions that mirror the actual TEAS format. Our practice exams include 50 science questions per exam, each with detailed explanations to help you learn from your mistakes.

Common Mistakes to Avoid

• Spending too much time on chemistry at the expense of anatomy
• Memorizing facts without understanding underlying concepts
• Not practicing with timed tests
• Ignoring scientific reasoning questions
• Cramming the night before instead of consistent study

Quick Reference: Must-Know Facts

Memorize these high-yield facts that frequently appear on the TEAS:

• Normal body temperature: 98.6°F (37°C)
• Normal blood pH: 7.35-7.45
• Blood flows: Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle → Body
• Mitochondria = powerhouse of the cell (produces ATP)
• DNA → RNA → Protein (central dogma)
• Small intestine = primary site of nutrient absorption
• Nephron = functional unit of the kidney
• Neuron = basic unit of the nervous system

Your Science Section Action Plan

Here's your week-by-week plan to master TEAS Science:

• Week 1: Cardiovascular and respiratory systems
• Week 2: Digestive and urinary systems
• Week 3: Nervous and musculoskeletal systems + review
• Week 4: Cell biology and genetics
• Week 5: Chemistry fundamentals
• Week 6: Full practice tests and targeted review

Start Mastering TEAS Science Today

The Science section may seem intimidating, but with systematic study and quality practice materials, you can achieve a competitive score. Remember: every nurse who came before you passed this same test. You've got this!

Ready to put your knowledge to the test? Try our full-length practice exams with 50 science questions each, or start with our science flashcards to build your foundation. Your nursing career starts with preparation—begin today.