TEAS 7 SCIENCE ANSWERS 2026/2027 | Complete All
Answers Correct | ATI TEAS Version 7 Science Section |
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[SECTION 1: HUMAN ANATOMY & PHYSIOLOGY (Q1-45)]
[Subsection: Cardiovascular & Respiratory (Q1-8)]
Q1. A patient presents with chest pain and shortness of breath. An ECG shows
ST-segment elevation. Which coronary artery is most likely occluded based on the
affected heart region?
A. Right coronary artery supplying the right atrium
B. Left anterior descending artery supplying the anterior left ventricle [CORRECT]
C. Circumflex artery supplying the left atrium only
D. Posterior descending artery supplying the right ventricle
Rationale: The left anterior descending (LAD) artery supplies the anterior wall of the left
ventricle and interventricular septum; LAD occlusion causes anterior ST-elevation MI
with classic chest pain and dyspnea. The right coronary artery (A) supplies the right
ventricle and inferior wall. The circumflex (C) supplies the lateral left ventricle. The
posterior descending (D) supplies the inferior septum. TEAS Tip: Remember "LAD =
Anterior = Worst" for high-yield recall.
Q2. Blood flows through the heart in which correct sequence?
,A. Right atrium → right ventricle → lungs → left atrium → left ventricle → body
[CORRECT]
B. Left atrium → left ventricle → lungs → right atrium → right ventricle → body
C. Right atrium → left ventricle → lungs → left atrium → right ventricle → body
D. Left ventricle → left atrium → lungs → right ventricle → right atrium → body
Rationale: Deoxygenated blood enters the right atrium, passes through the tricuspid
valve to the right ventricle, is pumped through the pulmonary valve to the lungs for
oxygenation, returns to the left atrium via pulmonary veins, passes through the mitral
valve to the left ventricle, and is pumped through the aortic valve to the systemic
circulation. TEAS Tip: "Try Pulling My Aorta" = Tricuspid, Pulmonary, Mitral, Aortic valves
in order.
Q3. Which structure prevents the backflow of blood from the left ventricle into the left
atrium during ventricular systole?
A. Aortic semilunar valve
B. Pulmonary semilunar valve
C. Bicuspid (mitral) valve [CORRECT]
D. Tricuspid valve
Rationale: The bicuspid (mitral) valve closes during ventricular systole to prevent
regurgitation into the left atrium. The aortic valve (A) prevents backflow into the left
ventricle from the aorta. The pulmonary valve (B) prevents backflow into the right
ventricle. The tricuspid valve (D) is on the right side of the heart. TEAS Tip: Left side =
bicuspid/mitral; Right side = tricuspid.
Q4. During gas exchange in the alveoli, oxygen moves from the alveolar air into the
blood by which mechanism?
A. Active transport against the concentration gradient
B. Facilitated diffusion through aquaporins
,C. Simple diffusion down the partial pressure gradient [CORRECT]
D. Osmosis across the alveolar membrane
Rationale: Oxygen moves from alveoli (high PO2 ~104 mmHg) to pulmonary capillaries
(low PO2 ~40 mmHg) by simple diffusion—passive movement down the partial
pressure gradient. Active transport (A) requires ATP and moves against gradients.
Facilitated diffusion (B) uses protein carriers for larger molecules. Osmosis (D) refers to
water movement. TEAS Tip: Gas exchange is always simple diffusion; no energy or
carriers needed.
Q5. A patient with chronic obstructive pulmonary disease (COPD) has difficulty exhaling
fully. Which respiratory structure is most likely affected?
A. Nasal conchae
B. Bronchioles and alveolar walls [CORRECT]
C. Larynx and vocal cords
D. Pleural membranes
Rationale: COPD primarily affects the bronchioles (chronic bronchitis causes
inflammation and mucus) and alveolar walls (emphysema destroys elastic tissue),
leading to airway collapse during exhalation. The nasal conchae (A) warm and humidify
air. The larynx (C) produces sound. The pleura (D) reduce friction. TEAS Tip: COPD =
Chronic Bronchitis + Emphysema = Small airways + Alveoli destruction.
Q6. Which blood vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein [CORRECT]
C. Superior vena cava
D. Inferior vena cava
, Rationale: The pulmonary veins are the only veins that carry oxygenated blood,
transporting it from the lungs to the left atrium. The pulmonary artery (A) carries
deoxygenated blood to the lungs. The venae cavae (C, D) carry deoxygenated blood to
the right atrium. TEAS Tip: "Arteries Away from heart"—except pulmonary artery carries
deoxygenated blood; "Veins to heart"—except pulmonary veins carry oxygenated blood.
Q7. A patient's blood pressure is recorded as 140/90 mmHg. Which statement correctly
identifies these values?
A. 140 is diastolic pressure; 90 is systolic pressure
B. 140 is systolic pressure; 90 is diastolic pressure [CORRECT]
C. Both values represent mean arterial pressure
D. 140 is pulse pressure; 90 is mean arterial pressure
Rationale: Blood pressure is recorded as systolic over diastolic (140/90). Systolic
pressure occurs during ventricular contraction; diastolic pressure occurs during
ventricular relaxation. Mean arterial pressure (C) = diastolic + 1/3(systolic - diastolic).
Pulse pressure (D) = systolic - diastolic. TEAS Tip: "Systolic = Squeeze; Diastolic = Rest."
Q8. During strenuous exercise, which physiological change occurs to meet increased
oxygen demands?
A. Bronchioles constrict and heart rate decreases
B. Bronchioles dilate, heart rate increases, and stroke volume increases [CORRECT]
C. Alveolar surface area decreases and breathing rate slows
D. Blood is shunted away from skeletal muscles to the digestive system
Rationale: Exercise triggers sympathetic activation: bronchioles dilate to increase
airflow, heart rate and stroke volume increase to deliver more oxygenated blood, and
blood is shunted TO skeletal muscles (not away). Bronchiole constriction (A) and
Answers Correct | ATI TEAS Version 7 Science Section |
Pass Guaranteed - A+ Graded
[SECTION 1: HUMAN ANATOMY & PHYSIOLOGY (Q1-45)]
[Subsection: Cardiovascular & Respiratory (Q1-8)]
Q1. A patient presents with chest pain and shortness of breath. An ECG shows
ST-segment elevation. Which coronary artery is most likely occluded based on the
affected heart region?
A. Right coronary artery supplying the right atrium
B. Left anterior descending artery supplying the anterior left ventricle [CORRECT]
C. Circumflex artery supplying the left atrium only
D. Posterior descending artery supplying the right ventricle
Rationale: The left anterior descending (LAD) artery supplies the anterior wall of the left
ventricle and interventricular septum; LAD occlusion causes anterior ST-elevation MI
with classic chest pain and dyspnea. The right coronary artery (A) supplies the right
ventricle and inferior wall. The circumflex (C) supplies the lateral left ventricle. The
posterior descending (D) supplies the inferior septum. TEAS Tip: Remember "LAD =
Anterior = Worst" for high-yield recall.
Q2. Blood flows through the heart in which correct sequence?
,A. Right atrium → right ventricle → lungs → left atrium → left ventricle → body
[CORRECT]
B. Left atrium → left ventricle → lungs → right atrium → right ventricle → body
C. Right atrium → left ventricle → lungs → left atrium → right ventricle → body
D. Left ventricle → left atrium → lungs → right ventricle → right atrium → body
Rationale: Deoxygenated blood enters the right atrium, passes through the tricuspid
valve to the right ventricle, is pumped through the pulmonary valve to the lungs for
oxygenation, returns to the left atrium via pulmonary veins, passes through the mitral
valve to the left ventricle, and is pumped through the aortic valve to the systemic
circulation. TEAS Tip: "Try Pulling My Aorta" = Tricuspid, Pulmonary, Mitral, Aortic valves
in order.
Q3. Which structure prevents the backflow of blood from the left ventricle into the left
atrium during ventricular systole?
A. Aortic semilunar valve
B. Pulmonary semilunar valve
C. Bicuspid (mitral) valve [CORRECT]
D. Tricuspid valve
Rationale: The bicuspid (mitral) valve closes during ventricular systole to prevent
regurgitation into the left atrium. The aortic valve (A) prevents backflow into the left
ventricle from the aorta. The pulmonary valve (B) prevents backflow into the right
ventricle. The tricuspid valve (D) is on the right side of the heart. TEAS Tip: Left side =
bicuspid/mitral; Right side = tricuspid.
Q4. During gas exchange in the alveoli, oxygen moves from the alveolar air into the
blood by which mechanism?
A. Active transport against the concentration gradient
B. Facilitated diffusion through aquaporins
,C. Simple diffusion down the partial pressure gradient [CORRECT]
D. Osmosis across the alveolar membrane
Rationale: Oxygen moves from alveoli (high PO2 ~104 mmHg) to pulmonary capillaries
(low PO2 ~40 mmHg) by simple diffusion—passive movement down the partial
pressure gradient. Active transport (A) requires ATP and moves against gradients.
Facilitated diffusion (B) uses protein carriers for larger molecules. Osmosis (D) refers to
water movement. TEAS Tip: Gas exchange is always simple diffusion; no energy or
carriers needed.
Q5. A patient with chronic obstructive pulmonary disease (COPD) has difficulty exhaling
fully. Which respiratory structure is most likely affected?
A. Nasal conchae
B. Bronchioles and alveolar walls [CORRECT]
C. Larynx and vocal cords
D. Pleural membranes
Rationale: COPD primarily affects the bronchioles (chronic bronchitis causes
inflammation and mucus) and alveolar walls (emphysema destroys elastic tissue),
leading to airway collapse during exhalation. The nasal conchae (A) warm and humidify
air. The larynx (C) produces sound. The pleura (D) reduce friction. TEAS Tip: COPD =
Chronic Bronchitis + Emphysema = Small airways + Alveoli destruction.
Q6. Which blood vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein [CORRECT]
C. Superior vena cava
D. Inferior vena cava
, Rationale: The pulmonary veins are the only veins that carry oxygenated blood,
transporting it from the lungs to the left atrium. The pulmonary artery (A) carries
deoxygenated blood to the lungs. The venae cavae (C, D) carry deoxygenated blood to
the right atrium. TEAS Tip: "Arteries Away from heart"—except pulmonary artery carries
deoxygenated blood; "Veins to heart"—except pulmonary veins carry oxygenated blood.
Q7. A patient's blood pressure is recorded as 140/90 mmHg. Which statement correctly
identifies these values?
A. 140 is diastolic pressure; 90 is systolic pressure
B. 140 is systolic pressure; 90 is diastolic pressure [CORRECT]
C. Both values represent mean arterial pressure
D. 140 is pulse pressure; 90 is mean arterial pressure
Rationale: Blood pressure is recorded as systolic over diastolic (140/90). Systolic
pressure occurs during ventricular contraction; diastolic pressure occurs during
ventricular relaxation. Mean arterial pressure (C) = diastolic + 1/3(systolic - diastolic).
Pulse pressure (D) = systolic - diastolic. TEAS Tip: "Systolic = Squeeze; Diastolic = Rest."
Q8. During strenuous exercise, which physiological change occurs to meet increased
oxygen demands?
A. Bronchioles constrict and heart rate decreases
B. Bronchioles dilate, heart rate increases, and stroke volume increases [CORRECT]
C. Alveolar surface area decreases and breathing rate slows
D. Blood is shunted away from skeletal muscles to the digestive system
Rationale: Exercise triggers sympathetic activation: bronchioles dilate to increase
airflow, heart rate and stroke volume increase to deliver more oxygenated blood, and
blood is shunted TO skeletal muscles (not away). Bronchiole constriction (A) and
