TEAS 6 Science Mastery Assessment Actual
Exam 2026/2027 – Complete Questions and
Answers with Detailed Rationales – Pass
Guaranteed – A+ Graded
Section 1: Human Anatomy & Physiology – Body Systems
Q1: A patient is diagnosed with a blockage in the coronary artery. Which of the following
physiological consequences is most directly associated with this condition?
A. Decreased blood flow to the lungs
B. Reduced oxygen supply to the heart muscle [CORRECT]
C. Increased pressure in the superior vena cava
D. Decreased nutrient absorption in the small intestine
Correct Answer: B
Rationale: The coronary arteries are specifically responsible for supplying blood to the
myocardium (heart muscle); a blockage here restricts oxygen delivery, which can lead to
ischemia or a heart attack.
Q2: During the cardiac cycle, the semilunar valves (aortic and pulmonic) close to
prevent backflow of blood. This closure generates which of the following heart sounds?
A. S1 ("lub")
B. S2 ("dub") [CORRECT]
C. S3
D. Murmur
Correct Answer: B
Rationale: The S2 heart sound, known as the "dub," is produced when the semilunar
valves close at the beginning of ventricular diastole.
Q3: Which of the following lists the correct path of a red blood cell as it travels through
the systemic circulation?
A. Left ventricle → Aorta → Body organs → Vena cava → Right atrium [CORRECT]
B. Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium
C. Left atrium → Aorta → Left ventricle → Body organs
D. Right atrium → Aorta → Body organs → Pulmonary vein
Correct Answer: A
,Rationale: Systemic circulation carries oxygenated blood from the left ventricle out
through the aorta to the body, returning deoxygenated blood via the vena cava to the
right atrium.
Q4: A nurse is teaching a client about the respiratory system. Which anatomical
structure is the primary site of gas exchange (oxygen and carbon dioxide) within the
lungs?
A. Bronchioles
B. Trachea
C. Alveoli [CORRECT]
D. Pleura
Correct Answer: C
Rationale: The alveoli are tiny air sacs with thin walls surrounded by capillaries, creating
the respiratory membrane where oxygen diffuses into the blood and carbon dioxide
diffuses out.
Q5: When a person inhales, the diaphragm contracts. Which of the following describes
the immediate mechanical result of this contraction?
A. The diaphragm moves upward, increasing pressure in the thoracic cavity
B. The diaphragm flattens, decreasing pressure in the thoracic cavity [CORRECT]
C. The intercostal muscles relax, causing the ribs to move inward
D. The volume of the thoracic cavity decreases, forcing air out
Correct Answer: B
Rationale: During inhalation, the diaphragm contracts and flattens, which enlarges the
thoracic cavity volume and lowers intrapulmonary pressure, allowing air to rush in.
Q6: Digestion of which of the following macromolecules begins in the stomach, primarily
due to the action of pepsin?
A. Carbohydrates
B. Proteins [CORRECT]
C. Fats (Lipids)
D. Nucleic acids
Correct Answer: B
Rationale: Pepsin is an enzyme secreted in the stomach that breaks down proteins into
smaller peptides; carbohydrate digestion starts in the mouth, and fat digestion primarily
occurs in the small intestine.
Q7: Most nutrient absorption occurs in which section of the gastrointestinal tract?
A. Stomach
B. Large intestine
C. Small intestine [CORRECT]
, D. Esophagus
Correct Answer: C
Rationale: The small intestine (specifically the jejunum and ileum) has villi and microvilli
that massively increase surface area for the absorption of nutrients into the
bloodstream.
Q8: Which of the following pancreatic enzymes is responsible for breaking down lipids
(fats) into fatty acids and glycerol?
A. Amylase
B. Trypsin
C. Lipase [CORRECT]
D. Pepsin
Correct Answer: C
Rationale: Lipase is the specific enzyme that chemically digests fats; amylase breaks
down carbohydrates and trypsin breaks down proteins.
Q9: A neuron receives a signal that causes sodium ions to rush rapidly into the cell.
This sudden change in membrane potential is known as:
A. Depolarization [CORRECT]
B. Repolarization
C. Hyperpolarization
D. Resting potential
Correct Answer: A
Rationale: Depolarization occurs when the membrane potential becomes less negative
(more positive) due to the influx of sodium ions (Na+).
Q10: At a neuromuscular junction, which neurotransmitter is released to stimulate
muscle contraction?
A. GABA
B. Serotonin
C. Acetylcholine [CORRECT]
D. Dopamine
Correct Answer: C
Rationale: Acetylcholine is the neurotransmitter that bridges the gap between motor
neurons and muscle fibers, binding to receptors to initiate the contraction process.
Q11: Which of the following correctly describes the interaction between actin and
myosin during muscle contraction?
A. Myosin filaments shorten, pulling the actin filaments inward
B. Actin filaments slide over myosin filaments, shortening the sarcomere [CORRECT]
C. Calcium ions bind to myosin to release the actin
Exam 2026/2027 – Complete Questions and
Answers with Detailed Rationales – Pass
Guaranteed – A+ Graded
Section 1: Human Anatomy & Physiology – Body Systems
Q1: A patient is diagnosed with a blockage in the coronary artery. Which of the following
physiological consequences is most directly associated with this condition?
A. Decreased blood flow to the lungs
B. Reduced oxygen supply to the heart muscle [CORRECT]
C. Increased pressure in the superior vena cava
D. Decreased nutrient absorption in the small intestine
Correct Answer: B
Rationale: The coronary arteries are specifically responsible for supplying blood to the
myocardium (heart muscle); a blockage here restricts oxygen delivery, which can lead to
ischemia or a heart attack.
Q2: During the cardiac cycle, the semilunar valves (aortic and pulmonic) close to
prevent backflow of blood. This closure generates which of the following heart sounds?
A. S1 ("lub")
B. S2 ("dub") [CORRECT]
C. S3
D. Murmur
Correct Answer: B
Rationale: The S2 heart sound, known as the "dub," is produced when the semilunar
valves close at the beginning of ventricular diastole.
Q3: Which of the following lists the correct path of a red blood cell as it travels through
the systemic circulation?
A. Left ventricle → Aorta → Body organs → Vena cava → Right atrium [CORRECT]
B. Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium
C. Left atrium → Aorta → Left ventricle → Body organs
D. Right atrium → Aorta → Body organs → Pulmonary vein
Correct Answer: A
,Rationale: Systemic circulation carries oxygenated blood from the left ventricle out
through the aorta to the body, returning deoxygenated blood via the vena cava to the
right atrium.
Q4: A nurse is teaching a client about the respiratory system. Which anatomical
structure is the primary site of gas exchange (oxygen and carbon dioxide) within the
lungs?
A. Bronchioles
B. Trachea
C. Alveoli [CORRECT]
D. Pleura
Correct Answer: C
Rationale: The alveoli are tiny air sacs with thin walls surrounded by capillaries, creating
the respiratory membrane where oxygen diffuses into the blood and carbon dioxide
diffuses out.
Q5: When a person inhales, the diaphragm contracts. Which of the following describes
the immediate mechanical result of this contraction?
A. The diaphragm moves upward, increasing pressure in the thoracic cavity
B. The diaphragm flattens, decreasing pressure in the thoracic cavity [CORRECT]
C. The intercostal muscles relax, causing the ribs to move inward
D. The volume of the thoracic cavity decreases, forcing air out
Correct Answer: B
Rationale: During inhalation, the diaphragm contracts and flattens, which enlarges the
thoracic cavity volume and lowers intrapulmonary pressure, allowing air to rush in.
Q6: Digestion of which of the following macromolecules begins in the stomach, primarily
due to the action of pepsin?
A. Carbohydrates
B. Proteins [CORRECT]
C. Fats (Lipids)
D. Nucleic acids
Correct Answer: B
Rationale: Pepsin is an enzyme secreted in the stomach that breaks down proteins into
smaller peptides; carbohydrate digestion starts in the mouth, and fat digestion primarily
occurs in the small intestine.
Q7: Most nutrient absorption occurs in which section of the gastrointestinal tract?
A. Stomach
B. Large intestine
C. Small intestine [CORRECT]
, D. Esophagus
Correct Answer: C
Rationale: The small intestine (specifically the jejunum and ileum) has villi and microvilli
that massively increase surface area for the absorption of nutrients into the
bloodstream.
Q8: Which of the following pancreatic enzymes is responsible for breaking down lipids
(fats) into fatty acids and glycerol?
A. Amylase
B. Trypsin
C. Lipase [CORRECT]
D. Pepsin
Correct Answer: C
Rationale: Lipase is the specific enzyme that chemically digests fats; amylase breaks
down carbohydrates and trypsin breaks down proteins.
Q9: A neuron receives a signal that causes sodium ions to rush rapidly into the cell.
This sudden change in membrane potential is known as:
A. Depolarization [CORRECT]
B. Repolarization
C. Hyperpolarization
D. Resting potential
Correct Answer: A
Rationale: Depolarization occurs when the membrane potential becomes less negative
(more positive) due to the influx of sodium ions (Na+).
Q10: At a neuromuscular junction, which neurotransmitter is released to stimulate
muscle contraction?
A. GABA
B. Serotonin
C. Acetylcholine [CORRECT]
D. Dopamine
Correct Answer: C
Rationale: Acetylcholine is the neurotransmitter that bridges the gap between motor
neurons and muscle fibers, binding to receptors to initiate the contraction process.
Q11: Which of the following correctly describes the interaction between actin and
myosin during muscle contraction?
A. Myosin filaments shorten, pulling the actin filaments inward
B. Actin filaments slide over myosin filaments, shortening the sarcomere [CORRECT]
C. Calcium ions bind to myosin to release the actin
