ATI TEAS 7 Science Practice Test 2025/2026 – Updated Questions with Correct Answers & Expert Rationales

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‭ TI TEAS 7 Science Practice Test 2025/2026 –‬
A
‭Updated Questions with Correct Answers &‬
‭Expert Rationales‬
‭Student Name:‬‭_________________________‬ ‭Date‬‭:‬‭_______________‬
‭Time Limit‬‭:‬‭60 minutes‬‭Total Questions‬‭:‬‭50‬


‭Instructions‬
‭ omplete all 50 multiple-choice questions within the 60-minute time limit. Read each question carefully‬
C
‭and select the single best answer. This test covers human body systems, chemistry in the body, scientific‬
‭reasoning, and cell structure and function, with application-based items as per the TEAS 7 format.‬
‭Calculators are not permitted. Good luck!‬




‭Section 1: Human Body Systems (Questions 1–15)‬
‭Question 1‬

‭ hich structure in the respiratory system is responsible for gas exchange?‬
W
‭A. Trachea‬
‭B.‬‭Alveoli‬
‭C. Bronchi‬
‭D. Diaphragm‬

‭ orrect Answer:‬‭B. Alveoli‬
C
‭Explanation‬‭: Alveoli are tiny air sacs in the lungs‬‭where oxygen and carbon dioxide are exchanged with‬
‭the bloodstream. The trachea (A) conducts air, bronchi (C) branch into smaller airways, and the‬
‭diaphragm (D) aids in breathing but does not perform gas exchange.‬




‭Question 2‬

,‭ client reports chest pain and shortness of breath. Which body system should the nurse assess first?‬
A
‭A. Digestive‬
‭B.‬‭Cardiovascular‬
‭C. Musculoskeletal‬
‭D. Endocrine‬

‭ orrect Answer:‬‭B. Cardiovascular‬
C
‭Explanation‬‭: Chest pain and shortness of breath suggest‬‭issues with the cardiovascular or respiratory‬
‭system, but cardiovascular (e.g., heart attack) is prioritized due to potential severity. Digestive (A),‬
‭musculoskeletal (C), and endocrine (D) systems are less likely causes.‬




‭Question 3‬

‭ hich organ in the digestive system primarily absorbs water from digested food?‬
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‭A. Stomach‬
‭B. Small intestine‬
‭C.‬‭Large intestine‬
‭D. Pancreas‬

‭ orrect Answer:‬‭C. Large intestine‬
C
‭Explanation‬‭: The large intestine absorbs water, forming‬‭solid feces. The stomach (A) breaks down food,‬
‭the small intestine (B) absorbs nutrients, and the pancreas (D) produces digestive enzymes.‬




‭Question 4‬

‭ hat is the primary function of the nephrons in the kidneys?‬
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‭A. Produce urine‬
‭B.‬‭Filter blood and regulate fluid balance‬
‭C. Store urine‬
‭D. Secrete hormones‬

‭ orrect Answer:‬‭B. Filter blood and regulate fluid‬‭balance‬
C
‭Explanation‬‭: Nephrons filter blood, remove waste,‬‭and regulate fluid/electrolyte balance to produce‬
‭urine. Producing urine (A) is a result, not the primary function; the bladder stores urine (C), and hormone‬
‭secretion (D) is secondary.‬




‭Question 5‬

‭ hich part of the brain regulates heart rate and breathing?‬
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‭A. Cerebrum‬

, ‭ . Cerebellum‬
B
‭C.‬‭Medulla oblongata‬
‭D. Hypothalamus‬

‭ orrect Answer:‬‭C. Medulla oblongata‬
C
‭Explanation‬‭: The medulla oblongata controls involuntary‬‭functions like heart rate and breathing. The‬
‭cerebrum (A) manages higher functions, the cerebellum (B) coordinates movement, and the hypothalamus‬
‭(D) regulates hormones and homeostasis.‬




‭Question 6‬

‭ client with a fractured femur is at risk for which complication due to immobility?‬
A
‭A.‬‭Pulmonary embolism‬
‭B. Hyperglycemia‬
‭C. Acid reflux‬
‭D. Kidney stones‬

‭ orrect Answer:‬‭A. Pulmonary embolism‬
C
‭Explanation‬‭: Immobility increases the risk of blood‬‭clots, which can lead to pulmonary embolism.‬
‭Hyperglycemia (B), acid reflux (C), and kidney stones (D) are less directly related to immobility.‬




‭Question 7‬

‭ hich structure in the heart prevents backflow of blood from the ventricles to the atria?‬
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‭A.‬‭Atrioventricular valves‬
‭B. Semilunar valves‬
‭C. Coronary arteries‬
‭D. Chordae tendineae‬

‭ orrect Answer:‬‭A. Atrioventricular valves‬
C
‭Explanation‬‭: Atrioventricular valves (mitral and‬‭tricuspid) prevent backflow from ventricles to atria.‬
‭Semilunar valves (B) prevent backflow from arteries, coronary arteries (C) supply blood, and chordae‬
‭tendineae (D) anchor valves.‬




‭Question 8‬

‭ hich muscle type is responsible for involuntary contractions in the digestive tract?‬
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‭A. Skeletal‬
‭B.‬‭Smooth‬