Written to ATI's TEAS exam details
- Reading 26%
- Mathematics 22.7%
- Science 29.3%
- English and Language Usage 22%
Free · 2026 · 29.3% of the ATI TEAS 7 ATI TEAS Science practice questions
Science is 29.3% of the ATI TEAS 7. Try the first 3 questions free, no sign-up. Full Prep unlocks the rest of this test, your score by domain and every explanation.
A person walks into a cold room. Thermoreceptors in the skin detect the drop in temperature and send signals to the hypothalamus. The hypothalamus compares the signal to the body's set point and then signals skeletal muscles, which begin shivering to generate heat. In this feedback loop, what role do the skeletal muscles play?
Tap an answer, or press A to D
Human anatomy and physiology (the largest sub-area on the exam), biology, chemistry and scientific reasoning. 44 scored questions, the biggest section.
What the ATI TEAS 7 exam tests in Science
- Human anatomy and physiology (18 of 44 scored items): general anatomy (organization, tissues, directional terms, planes, cavities, homeostasis); cardiovascular; respiratory; digestive; nervous; muscular; skeletal; integumentary; endocrine; urinary; immune and lymphatic; reproductive
- Biology (9 of 44 scored items): macromolecules and enzymes; cell structure and transport; mitosis and meiosis; DNA, RNA and protein synthesis; Mendelian genetics; microorganisms and disease
- Chemistry (8 of 44 scored items): atomic structure and the periodic table; chemical bonds; states of matter and changes; chemical reactions and balancing; solutions; acids, bases and pH
- Scientific reasoning (9 of 44 scored items): scientific method; experimental design and variables; measurement and lab tools; interpreting data; correlation vs causation; evaluating conclusions
High-yield science facts
- Levels of organization: chemical → cell → tissue → organ → organ system → organism.
- Four tissue types: epithelial (covers, lines, forms glands); connective (bone, blood, cartilage, fat, tendons); muscle; nervous.
- Directional terms: superior/inferior; anterior (ventral)/posterior (dorsal); medial/lateral; proximal/distal (the wrist is distal to the elbow); superficial/deep.
- Planes: sagittal divides left and right (midsagittal = equal halves); frontal (coronal) divides front and back; transverse divides top and bottom.
- Dorsal cavity = cranial + vertebral. Ventral cavity = thoracic (pleural, pericardial, mediastinum) + abdominopelvic, separated by the diaphragm.
- Negative feedback reverses a change (temperature, blood glucose, blood pressure, calcium). Positive feedback amplifies a change until an event ends it (oxytocin in labor, blood clotting, milk let-down).
| Step | Structure |
|---|---|
| 1 | Superior/inferior vena cava → right atrium |
| 2 | Tricuspid valve → right ventricle |
| 3 | Pulmonary valve → pulmonary arteries (deoxygenated) → lungs |
| 4 | Pulmonary veins (oxygenated) → left atrium |
| 5 | Mitral (bicuspid) valve → left ventricle (thickest wall) |
| 6 | Aortic valve → aorta → body |
The full ATI TEAS High-Yield Cram Sheet comes with full prep.
Common science traps
- Arteries are defined by direction (away from the heart), not oxygen: pulmonary arteries carry deoxygenated blood.
- Bile emulsifies fat but is not an enzyme.
- Most absorption happens in the small intestine, not the stomach.
- Mixing up sympathetic and parasympathetic effects.
- Tendon (muscle to bone) vs ligament (bone to bone).
- ADH and aldosterone both increase water retention, by different routes.
- A vaccine gives active immunity; injected antibodies give passive immunity.
- Mitosis (2 identical diploid cells) vs meiosis (4 different haploid cells).
Free ATI TEAS science practice questions
Question 1
A student dissolves 15 g of sugar in 135 g of water. What is the concentration of sugar in the solution, as a percent by mass?
- A90%
- B15%
- C11.1%
- D10%
Show answer and explanation
Answer: D. Percent by mass = solute mass ÷ total solution mass × 100 = 15 ÷ (15 + 135) × 100 = 15 ÷ 150 × 100 = 10%.
Why not A: This is the percent of water in the solution (135 ÷ 150), not the percent of sugar.
Why not B: This treats the 15 g of solute as if it were already a percent. It ignores the total solution mass.
Why not C: This divides by the mass of the water only (15 ÷ 135). The denominator must be the total mass of the solution, 150 g.
Remember: Percent by mass equals the solute mass divided by the total solution mass (solute plus solvent), times 100.
Question 2
Which hormone is made and released by the anterior pituitary gland?
- AProlactin
- BOxytocin
- CAntidiuretic hormone (ADH)
- DMelatonin
Show answer and explanation
Answer: A. Prolactin, which stimulates milk production, is one of the anterior pituitary hormones.
Why not B: Oxytocin is also made in the hypothalamus and released from the posterior pituitary.
Why not C: ADH is made in the hypothalamus and released from the posterior pituitary.
Why not D: Melatonin is secreted by the pineal gland, not the pituitary.
Remember: Anterior pituitary: GH, TSH, ACTH, FSH, LH, prolactin; posterior pituitary releases only ADH and oxytocin.
Question 3
A student weighed equal-sized potato cores, soaked each core in a different sucrose solution for 2 hours, and then reweighed them. Sucrose concentration (M) | Change in mass (%) 0.0 | +18 0.2 | +7 0.4 | -4 0.6 | -13 Which sucrose concentration range is most likely isotonic to the potato cells?
- AAbove 0.6 M
- BBetween 0.2 M and 0.4 M
- CBetween 0.4 M and 0.6 M
- DBetween 0.0 M and 0.2 M
Show answer and explanation
Answer: B. The mass change switches from a gain (+7%) to a loss (-4%) in this range. The point of no net water movement, where the change is 0%, therefore lies here.
Why not A: Mass loss grows larger as concentration rises, so stronger solutions are even more hypertonic, not isotonic.
Why not C: Cores lost mass across this whole range, so these solutions are hypertonic to the potato cells.
Why not D: Cores gained mass across this whole range, so these solutions are hypotonic to the potato cells.
Remember: An isotonic solution causes no net water movement, so look for where the mass change crosses zero.
Question 4
A sprinter's muscle cells are carrying out aerobic cellular respiration. Which substances do the cells use up as reactants?
- AGlucose and carbon dioxide
- BOxygen and lactic acid
- CGlucose and oxygen
- DCarbon dioxide and water
Show answer and explanation
Answer: C. Aerobic respiration combines glucose and O₂ to release energy as ATP.
Why not A: CO₂ is released by respiration, not consumed.
Why not B: Lactic acid comes from fermentation, which happens without oxygen. It is not a reactant of aerobic respiration.
Why not D: CO₂ and water are the products of respiration, and they are the reactants of photosynthesis.
Remember: Respiration: glucose + O₂ → CO₂ + H₂O + ATP, the reverse of photosynthesis.
Question 5
After a long hike on a hot day without drinking water, Devon becomes dehydrated. Which change in his body helps conserve water?
- AThe posterior pituitary releases less ADH, so the kidneys reabsorb more water and urine becomes dilute.
- BThe pancreas releases more insulin, so the kidneys reabsorb more water and urine becomes dilute.
- CThe anterior pituitary releases more TSH, so the kidneys reabsorb more water and urine becomes concentrated.
- DThe posterior pituitary releases more ADH, so the kidneys reabsorb more water and urine becomes concentrated.
Show answer and explanation
Answer: D. ADH increases water reabsorption in the collecting ducts, producing a smaller volume of concentrated urine.
Why not A: Less ADH means less water reabsorption and more dilute urine, the opposite of conserving water.
Why not B: Insulin regulates blood glucose, not kidney water reabsorption.
Why not C: TSH stimulates the thyroid; it does not control water reabsorption in the kidneys.
Remember: Dehydration raises ADH, which makes the kidneys keep water and produce concentrated urine.
Full ATI TEAS prep
Practice every ATI TEAS domain
ATI TEAS Full Prep
$396 months of access
$0.22 a day
One-time payment. Nothing renews.
- 1450+ ATI TEAS practice questions, every answer choice explained
- Unlimited timed mock exams (170 questions)
- Unit Conversion & Dimensional Analysis Drill: all 15 rounds
- Full 13-page printable High-Yield Cram Sheet (PDF)
100% Pass Guarantee + 7-day money-back. How it works