TEAS Science Practice Test
This is a free 15-question sampler in the style of the TEAS 7 Science section. It covers human anatomy and physiology, biology basics, chemistry basics and scientific reasoning, mixing multiple choice, select all that apply and fill in the blank. Answer all 15 questions, then check your score and read the explanation for every question.
Which chamber of the heart pumps oxygenated blood out to the body?
All Nursing & Health quizzes
- Practice test · 15 questions
TEAS Math Practice Test
- Practice test · 12 questions
TEAS Reading Practice Test
- Practice test · 15 questions
TEAS English Practice Test
Now make your own
Upload your prep book, slides or notes, or just tell Bo what you want to learn. You do not need a document to start.
All 15 questions at a glance
Prefer to read before you play? Every question in the sampler is listed below. Answers and explanations stay collapsed until you open them.
1. Which chamber of the heart pumps oxygenated blood out to the body?
- A. Right atrium
- B. Right ventricle
- C. Left atrium
- D. Left ventricle
Show answer and explanation
Answer: D. Left ventricle
The left ventricle pushes oxygenated blood through the aorta into systemic circulation. The right side of the heart only sends blood to the lungs.
2. Gas exchange in the lungs takes place in the:
- A. Trachea
- B. Bronchi
- C. Alveoli
- D. Pleura
Show answer and explanation
Answer: C. Alveoli
Alveoli are tiny air sacs wrapped in capillaries. Their thin walls and huge combined surface area let oxygen and carbon dioxide diffuse quickly.
3. Which hormone lowers blood glucose levels?
- A. Glucagon
- B. Insulin
- C. Cortisol
- D. Epinephrine
Show answer and explanation
Answer: B. Insulin
Insulin, released by the pancreatic beta cells, moves glucose from the blood into cells. Glucagon does the opposite and raises blood glucose.
4. Complete the sentence.
The basic functional unit of the kidney, which filters blood and forms urine, is called the _____.
Options for blank 1: glomerulus, nephron, ureter, renal pelvis
Show answer and explanation
Answer: nephron
The nephron is the working unit of the kidney. Each kidney holds about a million of them; they filter blood, reabsorb what the body keeps and turn the rest into urine.
5. Which part of a neuron receives incoming signals?
- A. Axon
- B. Dendrites
- C. Myelin sheath
- D. Synaptic terminal
Show answer and explanation
Answer: B. Dendrites
Dendrites are branched extensions that pick up signals from other neurons and carry them toward the cell body. The axon sends signals away.
6. Which of the following are functions of the liver?
Select all that apply.
- A. Producing bile
- B. Detoxifying substances in the blood
- C. Storing glycogen
- D. Producing insulin
- E. Filtering blood to form urine
Show answer and explanation
Answer: A. Producing bile, B. Detoxifying substances in the blood, C. Storing glycogen
The liver makes bile for fat digestion, detoxifies drugs and other substances, and stores glucose as glycogen. Insulin comes from the pancreas, and urine formation happens in the kidneys.
7. In DNA, adenine always pairs with:
- A. Guanine
- B. Cytosine
- C. Thymine
- D. Uracil
Show answer and explanation
Answer: C. Thymine
DNA base pairing is A with T and G with C. Uracil replaces thymine only in RNA.
8. Which of the following vessels carry blood toward the heart?
Select all that apply.
- A. Veins
- B. Arterioles
- C. Venules
- D. The aorta
- E. The superior vena cava
Show answer and explanation
Answer: A. Veins, C. Venules, E. The superior vena cava
Veins, venules and the venae cavae all return blood to the heart. Arterioles and the aorta carry blood away from it.
9. Complete the sentence.
The organelle that runs cellular respiration and produces most of a cell's ATP is the _____.
Options for blank 1: ribosome, nucleus, mitochondrion, Golgi apparatus
Show answer and explanation
Answer: mitochondrion
Mitochondria convert glucose and oxygen into ATP through cellular respiration. That is why they are called the powerhouse of the cell.
10. What does mitosis produce?
- A. Two genetically identical diploid cells
- B. Four genetically different haploid cells
- C. One larger diploid cell
- D. Two haploid gametes
Show answer and explanation
Answer: A. Two genetically identical diploid cells
Mitosis copies a cell into two identical diploid daughter cells for growth and repair. Meiosis is the process that makes four haploid gametes.
11. A solution with a pH of 3 is how much more acidic than a solution with a pH of 6?
- A. 2 times more acidic
- B. 3 times more acidic
- C. 100 times more acidic
- D. 1,000 times more acidic
Show answer and explanation
Answer: D. 1,000 times more acidic
The pH scale is logarithmic, so each whole number is a tenfold change. Three steps means 10 x 10 x 10, or 1,000 times more acidic.
12. Complete the sentence.
An element's atomic number equals its number of _____, and its mass number adds the _____.
Options for blank 1: protons, neutrons, electrons, energy levels
Options for blank 2: electrons, neutrons, isotopes, valence shells
Show answer and explanation
Answer: protons, neutrons
The atomic number is the proton count, and it defines the element. Mass number is protons plus neutrons.
13. Which type of chemical bond forms when two atoms share a pair of electrons?
- A. Ionic bond
- B. Covalent bond
- C. Hydrogen bond
- D. Metallic bond
Show answer and explanation
Answer: B. Covalent bond
Covalent bonds share electron pairs between atoms. Ionic bonds transfer electrons instead, and hydrogen bonds are weak attractions between molecules.
14. A student tests whether a fertilizer speeds up plant growth. Which of the following belong in a well-designed version of this experiment?
Select all that apply.
- A. A control group of plants that get no fertilizer
- B. Changing only the fertilizer between groups
- C. Multiple plants in each group
- D. Giving the fertilized plants extra sunlight too
Show answer and explanation
Answer: A. A control group of plants that get no fertilizer, B. Changing only the fertilizer between groups, C. Multiple plants in each group
A fair test needs an untreated control group, a single changed variable and repeated trials. Adding extra sunlight to one group changes two variables at once, so you could not tell what caused the difference.
15. In an experiment, which variable does the researcher deliberately change?
- A. The dependent variable
- B. The independent variable
- C. The controlled variable
- D. The confounding variable
Show answer and explanation
Answer: B. The independent variable
The independent variable is what you change on purpose. The dependent variable is what you measure in response.
What's on the TEAS 7 Science section
The Science section of the ATI TEAS 7 gives you 50 questions and 60 minutes, which makes it the longest of the four sections. 44 of those questions are scored and 6 are unscored pretest questions, but you cannot tell which is which, so treat every question as if it counts.
The scored questions break down into four content areas. Human anatomy and physiology is the biggest at 18 questions, covering the major organ systems: cardiovascular, respiratory, digestive, nervous, endocrine, urinary and more. Biology contributes 9 questions on cells, macromolecules, heredity and microorganisms. Chemistry contributes 8 questions on atomic structure, bonding, states of matter, acids and bases. Scientific reasoning rounds it out with 9 questions on experimental design, variables and reading data.
That mix is why anatomy and physiology should get the largest share of your study time. It is worth roughly twice as many points as any other science area, and it is also the hardest to cram, because it rewards understanding how systems work rather than memorizing isolated facts.
How to use this sampler
This sampler mirrors the real section's proportions in miniature: most questions cover anatomy and physiology, with biology, chemistry and scientific reasoning filling the rest. It also mixes the question formats the TEAS 7 actually uses, including select all that apply and fill in the blank, not just classic multiple choice.
Take it in one sitting without notes, aiming for about 90 seconds per question, then read the explanation for every question, including the ones you got right. Wrong answers tell you which content area to study next. If you missed the heart chamber question and the blood vessel question, that is a signal to review cardiovascular anatomy, not just those two facts.
When you finish, try the other sections too. The math, reading and English samplers linked below follow the same format, so together they give you a quick read on where you stand across the whole exam.
How StudyPDF builds full practice tests from your prep book
Fifteen questions can show you where you are weak. They cannot get you exam ready on their own, and generic question banks often drift away from what your specific prep book emphasizes.
StudyPDF takes a different route. You upload your own TEAS prep book, class notes or lecture slides, and Bo, the study agent, builds full-length practice tests from that exact material. Every question is grounded in your pages, and every explanation cites where the answer comes from, so you can flip straight to the source when something is unclear. You can regenerate fresh tests as often as you want, focus them on a single system like cardiovascular or endocrine, and track which concepts you keep missing. Starting is free.
Written by the StudyPDF team. Last updated 2026-08-19.