Why Science Determines Your Score
The TEAS 7 Science section contains 50 questions — more than any other section. It covers the broadest content range of any section and has the steepest learning curve for students who have been out of science coursework for more than a year. Students who score well in Science almost always achieve a competitive composite. Students who struggle in Science rarely compensate through other sections.
The section has four content domains: Human Anatomy & Physiology (the largest), Life and Physical Sciences, Biology, and Scientific Reasoning. Each requires a different preparation approach.
Human Anatomy & Physiology — Start Here
A&P accounts for approximately half the Science section. Cover the major body systems in this sequence, which moves from highest question frequency to lowest:
Cardiovascular system: Heart anatomy (chambers, valves, great vessels), cardiac cycle, blood pressure regulation, blood components and types. Know the path of blood through the heart and lungs completely.
Respiratory system: Structures from nasal cavity to alveoli, mechanics of breathing (diaphragm, intercostal muscles), gas exchange at the alveolar level, oxygen and carbon dioxide transport.
Renal system: Nephron structure and function, filtration, reabsorption, secretion, urine formation, acid-base balance contribution.
Immune system: Innate vs. adaptive immunity, B cells and T cells, antibodies, inflammatory response, vaccination mechanism.
Nervous system: Central vs. peripheral, neuron structure and signal transmission, action potential basics, autonomic nervous system (sympathetic vs. parasympathetic).
Musculoskeletal system: Bone types and structure, skeletal muscle contraction (sliding filament theory), joint types, major bones and muscle groups.
Endocrine system: Major glands and their hormones (pituitary, thyroid, adrenal, pancreas), feedback loops, insulin and glucagon specifically.
Biology — Cell First, Then Genetics
Cell biology is the foundation. Cover: cell organelles and their functions (mitochondria, ribosomes, nucleus, endoplasmic reticulum, Golgi apparatus), cell membrane structure and transport (diffusion, osmosis, active transport), cell division (mitosis and meiosis — know the phases and what happens in each).
Genetics: Mendelian inheritance, dominant and recessive patterns, Punnett squares, DNA structure and replication, protein synthesis (transcription and translation at a conceptual level). You do not need deep molecular biology — understand the flow from DNA to RNA to protein.
Ecology basics appear occasionally: food chains, energy flow, ecosystems, population dynamics. These are lower yield than cell biology and genetics — cover them last.
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Chemistry — Focus on What Actually Appears
The TEAS tests applied chemistry concepts, not advanced chemistry. High-yield topics: atomic structure (protons, neutrons, electrons, periodic table basics), chemical bonding (ionic vs. covalent), acids and bases (pH scale, buffers, the relationship between pH and hydrogen ion concentration), chemical reactions (reactants and products, balancing simple equations), solutions (solute, solvent, concentration, molarity at a basic level).
Skip: complex stoichiometry, thermodynamics, electrochemistry, organic chemistry nomenclature. These rarely if ever appear on the TEAS.
Scientific Reasoning — No Memorization Required
Scientific Reasoning questions give you all the information you need in the question itself. They test your ability to read experimental setups, interpret data from tables and graphs, identify variables (independent, dependent, controlled), and draw conclusions supported by the data.
The preparation strategy is different from content sections: practice reading experimental descriptions carefully and answering only from what is given. The most common error is bringing in outside knowledge and selecting an answer that is scientifically accurate but not supported by the specific data in the question. Always answer from the evidence provided, not from what you know to be true generally.
A Practical Study Sequence
Week 1: Cardiovascular, respiratory, and renal A&P. Week 2: Immune, nervous, musculoskeletal, and endocrine A&P. Week 3: Cell biology and genetics. Week 4: Chemistry fundamentals. Week 5: Scientific Reasoning practice (20 questions daily, timed). Week 6: Full Science section practice tests and weak area review.
Run a timed Science section practice test at the end of week 2 and again at the end of week 5. Track which topics produce the most errors and redirect study time accordingly. Most students find that 2–3 A&P topics account for the majority of their errors — closing those gaps produces outsized score improvement.