ATI TEAS Science Official Exam 2026/2027
Actual Exam Complete Questions and
Answers Detailed Rationales Pass
Guaranteed - A+ Graded
Total Questions: 50 | Time: 90 min | Pass: 80%
TABLE OF CONTENTS
Section 1 | Human Anatomy and Physiology | Q1 – Q10
Section 2 | Biology and Microbiology | Q11 – Q20
Section 3 | Chemistry | Q21 – Q30
Section 4 | Scientific Reasoning and Inquiry | Q31 – Q40
Section 5 | Integrated Science Applications | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
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SECTION 1: HUMAN ANATOMY AND PHYSIOLOGY Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 58-year-old man with a history of hypertension presents to the clinic for a routine
checkup. The nurse practitioner auscultates his heart and hears an abnormal sound
immediately after S2 during early diastole. This sound most likely corresponds to which
physiological event?
A. Atrial contraction
B. Isovolumetric ventricular contraction
C. Rapid passive ventricular filling ✓ CORRECT
D. Closure of the semilunar valves
Correct Answer: C
,Rationale: An S3 gallop occurs during early diastole when blood rapidly fills the
ventricles immediately after the mitral and tricuspid valves open. The sound is not
related to semilunar valve closure, which produces S2. In clinical practice, an S3 in older
adults often indicates ventricular dysfunction or volume overload.
Question 2 of 50
A physical therapist is evaluating a 24-year-old athlete who tore a muscle during
weightlifting. The therapist explains that the torn muscle fibers will regenerate using
satellite cells located beneath the basal lamina. Which muscle type possesses these
satellite cells and therefore retains regenerative capacity?
A. Cardiac muscle
B. Skeletal muscle ✓ CORRECT
C. Smooth muscle
D. Cardiac and smooth muscle equally
Correct Answer: B
Rationale: Skeletal muscle fibers contain satellite cells that lie beneath the basal lamina
and are activated to proliferate and fuse with damaged fibers during regeneration.
Cardiac muscle has very limited regenerative capacity and does not rely on satellite
cells for repair. This distinction is clinically relevant when predicting recovery from
muscle injuries.
Question 3 of 50
A nurse is caring for a 45-year-old patient with emphysema who struggles to exhale
fully. The nurse recalls that in healthy individuals, the primary mechanism responsible
for quiet expiration is passive and relies on which physical principle?
A. Active contraction of the internal intercostals
B. Contraction of the abdominal wall muscles
C. Elastic recoil of the lungs and chest wall ✓ CORRECT
, D. Relaxation of the diaphragm alone
Correct Answer: C
Rationale: During quiet breathing, expiration is a passive process driven primarily by the
elastic recoil of the lungs and chest wall rather than by active muscle contraction. While
the diaphragm does relax during expiration, the elastic properties of lung tissue provide
the main force for air movement. In emphysema, destruction of elastic fibers impairs
this recoil and leads to air trapping.
Question 4 of 50
During a neurological assessment of a 71-year-old stroke patient, the physician asks the
patient to touch her nose and then the examiner's finger. The patient consistently
overshoots the target. This finding suggests dysfunction of which cerebellar pathway
responsible for coordinating voluntary movement?
A. Spinothalamic tract
B. Corticospinal tract
C. Dorsal column-medial lemniscus pathway
D. Spinocerebellar tract ✓ CORRECT
Correct Answer: D
Rationale: The spinocerebellar tracts carry proprioceptive information to the cerebellum,
which coordinates and fine-tunes voluntary movements; damage produces dysmetria
and intention tremor. The corticospinal tract is the main voluntary motor pathway, but
its lesions cause weakness and spasticity rather than coordination deficits. This finding
localizes the stroke to the cerebellum or its connecting pathways.
Question 5 of 50
A 19-year-old college student is brought to the health center after fasting for 24 hours
for a religious observance. She feels shaky and confused. A rapid blood glucose test
Actual Exam Complete Questions and
Answers Detailed Rationales Pass
Guaranteed - A+ Graded
Total Questions: 50 | Time: 90 min | Pass: 80%
TABLE OF CONTENTS
Section 1 | Human Anatomy and Physiology | Q1 – Q10
Section 2 | Biology and Microbiology | Q11 – Q20
Section 3 | Chemistry | Q21 – Q30
Section 4 | Scientific Reasoning and Inquiry | Q31 – Q40
Section 5 | Integrated Science Applications | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: HUMAN ANATOMY AND PHYSIOLOGY Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 58-year-old man with a history of hypertension presents to the clinic for a routine
checkup. The nurse practitioner auscultates his heart and hears an abnormal sound
immediately after S2 during early diastole. This sound most likely corresponds to which
physiological event?
A. Atrial contraction
B. Isovolumetric ventricular contraction
C. Rapid passive ventricular filling ✓ CORRECT
D. Closure of the semilunar valves
Correct Answer: C
,Rationale: An S3 gallop occurs during early diastole when blood rapidly fills the
ventricles immediately after the mitral and tricuspid valves open. The sound is not
related to semilunar valve closure, which produces S2. In clinical practice, an S3 in older
adults often indicates ventricular dysfunction or volume overload.
Question 2 of 50
A physical therapist is evaluating a 24-year-old athlete who tore a muscle during
weightlifting. The therapist explains that the torn muscle fibers will regenerate using
satellite cells located beneath the basal lamina. Which muscle type possesses these
satellite cells and therefore retains regenerative capacity?
A. Cardiac muscle
B. Skeletal muscle ✓ CORRECT
C. Smooth muscle
D. Cardiac and smooth muscle equally
Correct Answer: B
Rationale: Skeletal muscle fibers contain satellite cells that lie beneath the basal lamina
and are activated to proliferate and fuse with damaged fibers during regeneration.
Cardiac muscle has very limited regenerative capacity and does not rely on satellite
cells for repair. This distinction is clinically relevant when predicting recovery from
muscle injuries.
Question 3 of 50
A nurse is caring for a 45-year-old patient with emphysema who struggles to exhale
fully. The nurse recalls that in healthy individuals, the primary mechanism responsible
for quiet expiration is passive and relies on which physical principle?
A. Active contraction of the internal intercostals
B. Contraction of the abdominal wall muscles
C. Elastic recoil of the lungs and chest wall ✓ CORRECT
, D. Relaxation of the diaphragm alone
Correct Answer: C
Rationale: During quiet breathing, expiration is a passive process driven primarily by the
elastic recoil of the lungs and chest wall rather than by active muscle contraction. While
the diaphragm does relax during expiration, the elastic properties of lung tissue provide
the main force for air movement. In emphysema, destruction of elastic fibers impairs
this recoil and leads to air trapping.
Question 4 of 50
During a neurological assessment of a 71-year-old stroke patient, the physician asks the
patient to touch her nose and then the examiner's finger. The patient consistently
overshoots the target. This finding suggests dysfunction of which cerebellar pathway
responsible for coordinating voluntary movement?
A. Spinothalamic tract
B. Corticospinal tract
C. Dorsal column-medial lemniscus pathway
D. Spinocerebellar tract ✓ CORRECT
Correct Answer: D
Rationale: The spinocerebellar tracts carry proprioceptive information to the cerebellum,
which coordinates and fine-tunes voluntary movements; damage produces dysmetria
and intention tremor. The corticospinal tract is the main voluntary motor pathway, but
its lesions cause weakness and spasticity rather than coordination deficits. This finding
localizes the stroke to the cerebellum or its connecting pathways.
Question 5 of 50
A 19-year-old college student is brought to the health center after fasting for 24 hours
for a religious observance. She feels shaky and confused. A rapid blood glucose test
