100+ Free TEAS Science Practice Questions

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Question 1

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Which valve separates the left atrium and left ventricle of the heart?

Aortic valve

Tricuspid valve

Pulmonary valve

Mitral (bicuspid) valve

to track

2026 Statistics

Key Facts: TEAS Science Exam

Total questions on TEAS Science

ATI Testing

Scored questions (6 unscored experimental)

ATI Testing

60 min

Section time limit

ATI Testing

41%

Share allocated to Anatomy & Physiology

ATI Testing

100

Free practice questions here

OpenExamPrep

ATI's TEAS 7 Science section delivers 50 items (44 scored) in 60 minutes, weighted toward Human Anatomy & Physiology (~41%), Biology (~20%), Chemistry (~18%), and Scientific Reasoning (~20%) for nursing-school applicants in 2026.

Sample TEAS Science Practice Questions

Try these sample questions to test your TEAS Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which organ is the largest of the integumentary system?

A.Liver

B.Skin

C.Heart

D.Lungs

Explanation: The skin is the largest organ of the integumentary system and the largest organ in the human body by surface area and weight. It consists of three primary layers — epidermis, dermis, and hypodermis — and functions in protection, thermoregulation, sensation, and vitamin D synthesis.

2Which layer of the skin contains blood vessels, nerves, hair follicles, and sweat glands?

A.Epidermis

B.Dermis

C.Hypodermis

D.Stratum corneum

Explanation: The dermis lies beneath the epidermis and contains blood vessels, nerve endings, hair follicles, sebaceous (oil) glands, and sweat glands. It provides structural support through collagen and elastin fibers and houses most of the skin's specialized accessory structures.

3What is the primary function of red blood cells (erythrocytes)?

A.Fighting infection

B.Transporting oxygen

C.Forming blood clots

D.Producing antibodies

Explanation: Red blood cells contain hemoglobin, an iron-containing protein that binds oxygen in the lungs and releases it to tissues throughout the body. Erythrocytes lack nuclei in mammals, which maximizes space for hemoglobin and oxygen transport.

4Through which chamber of the heart does oxygenated blood enter from the lungs?

A.Right atrium

B.Right ventricle

C.Left atrium

D.Left ventricle

Explanation: Oxygenated blood returns from the lungs via the pulmonary veins and enters the left atrium. From there it passes through the mitral (bicuspid) valve into the left ventricle, which pumps it out through the aorta to systemic circulation.

5The functional unit of the kidney responsible for filtering blood is called the:

A.Alveolus

B.Nephron

C.Sarcomere

D.Neuron

Explanation: The nephron is the microscopic functional unit of the kidney. Each kidney contains roughly one million nephrons, each composed of a glomerulus (filter), Bowman's capsule, and a tubule system that reabsorbs water and solutes and secretes wastes to form urine.

6Where in the kidney does filtration of blood plasma first occur?

A.Loop of Henle

B.Glomerulus

C.Collecting duct

D.Distal convoluted tubule

Explanation: Filtration begins in the glomerulus, a tuft of capillaries inside Bowman's capsule. Hydrostatic pressure forces water, ions, glucose, amino acids, and urea out of the blood and into the capsule, forming the glomerular filtrate that flows into the renal tubule.

7Which structure in the respiratory system is the primary site of gas exchange?

A.Bronchi

B.Trachea

C.Alveoli

D.Larynx

Explanation: Alveoli are tiny air-filled sacs at the terminal ends of the bronchioles. Their thin walls (one cell thick) are surrounded by capillaries, allowing oxygen to diffuse into the blood and carbon dioxide to diffuse out by simple diffusion across the respiratory membrane.

8Which muscle contracts and flattens to draw air into the lungs during inhalation?

A.Intercostal muscles only

B.Diaphragm

C.Pectoralis major

D.Latissimus dorsi

Explanation: The diaphragm is the primary muscle of respiration. When it contracts it flattens downward, expanding the thoracic cavity and lowering intrapulmonary pressure, which draws air into the lungs. Relaxation of the diaphragm allows passive exhalation.

9Where does most chemical digestion and nutrient absorption occur in the human digestive tract?

A.Stomach

B.Small intestine

C.Large intestine

D.Esophagus

Explanation: The small intestine — particularly the duodenum and jejunum — is where most chemical digestion is completed by pancreatic enzymes and bile, and where the majority of nutrient absorption occurs through villi and microvilli that vastly increase surface area.

10Which enzyme begins the chemical digestion of starches in the mouth?

A.Pepsin

B.Salivary amylase

C.Lipase

D.Trypsin

Explanation: Salivary amylase (also called ptyalin) is secreted by the salivary glands and begins breaking down complex carbohydrates (starches) into shorter chains and maltose while food is still in the mouth. Digestion of starch continues in the small intestine by pancreatic amylase.

About the TEAS Science Exam

The TEAS Science section is the highest-content subsection on the TEAS 7 nursing and allied-health admissions test. It tests Human Anatomy & Physiology (heaviest weighting), Biology, Chemistry, and Scientific Reasoning across 50 multiple-choice items in 60 minutes.

Questions

50 scored questions

Time Limit

60 minutes

Passing Score

School set (commonly 70+ composite)

Exam Fee

Bundled in TEAS 7 registration ($82-$116) (ATI / PSI testing centers)

TEAS Science Exam Content Outline

18 Q

Human Anatomy & Physiology

10 body systems — integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic/immune, respiratory, digestive, urinary

9 Q

Biology

Macromolecules, cell biology, mitosis vs meiosis, Mendelian genetics, DNA structure, protein synthesis

8 Q

Chemistry

Atomic structure, bonding, reactions, acids/bases, solutions, states of matter

9 Q

Scientific Reasoning

Experimental design, data interpretation, scientific method, lab safety

How to Pass the TEAS Science Exam

What You Need to Know

Passing score: School set (commonly 70+ composite)
Exam length: 50 questions
Time limit: 60 minutes
Exam fee: Bundled in TEAS 7 registration ($82-$116)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

TEAS Science Study Tips from Top Performers

1Spend the most prep time on A&P — it is ~41% of scored questions

2Build a Punnett-square reflex; expect at least one genetics question

3Memorize the pH scale, acids/bases identification, and reaction-type vocabulary

4Practice reading tables, graphs, and lab setups for the Scientific Reasoning subsection

Frequently Asked Questions

How many questions are on the TEAS Science section?

50 questions total — 44 scored and 6 unscored experimental items. You have 60 minutes.

Why is TEAS Science the hardest section?

ATI national data consistently shows Science is the lowest-average section. Anatomy & Physiology alone makes up ~41% of scored items and requires memorization of all 10 body systems.

Do I need biology and chemistry coursework first?

It helps but is not required. Most applicants self-study using prep materials. A&P 1 + A&P 2 college coursework substantially improves scores.