ATI TEAS CARDIOVASCULAR SYSTEM EXAM
PREP 2026–2027 | 200 PRACTICE
QUESTIONS, CORRECT ANSWERS &
DETAILED RATIONALES
1. Which chamber of the heart pumps oxygenated blood into the systemic
circulation?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
Rationale: The left ventricle pumps oxygenated blood through the aorta to the
tissues of the body.
2. Which blood vessel carries deoxygenated blood from the body back to
the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Vena cava
D. Aorta
Answer: C. Vena cava
Rationale: The superior and inferior venae cavae return deoxygenated blood
from the systemic circulation to the right atrium.
3. What is the primary function of the cardiovascular system?
A. Produce hormones
B. Transport substances throughout the body
C. Digest nutrients
D. Regulate skeletal movement
,Answer: B. Transport substances throughout the body
Rationale: The cardiovascular system transports oxygen, nutrients, hormones,
carbon dioxide, and metabolic wastes throughout the body.
4. Which structure prevents blood from flowing backward from the left
ventricle into the left atrium?
A. Tricuspid valve
B. Pulmonary valve
C. Aortic valve
D. Mitral valve
Answer: D. Mitral valve
Rationale: The mitral, or bicuspid, valve lies between the left atrium and left
ventricle and prevents backflow during ventricular contraction.
5. Which vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Superior vena cava
D. Inferior vena cava
Answer: B. Pulmonary vein
Rationale: Pulmonary veins carry oxygen-rich blood from the lungs to the left
atrium.
6. Which chamber receives deoxygenated blood from the systemic
circulation?
A. Left atrium
B. Left ventricle
C. Right atrium
D. Right ventricle
Answer: C. Right atrium
,Rationale: The right atrium receives deoxygenated blood returning from the
body through the superior and inferior venae cavae.
7. What is the largest artery in the human body?
A. Pulmonary artery
B. Carotid artery
C. Aorta
D. Femoral artery
Answer: C. Aorta
Rationale: The aorta is the body's largest artery and carries oxygenated blood
from the left ventricle to systemic circulation.
8. Which blood component is primarily responsible for transporting
oxygen?
A. Platelets
B. Plasma
C. Red blood cells
D. White blood cells
Answer: C. Red blood cells
Rationale: Red blood cells contain hemoglobin, a protein that binds and
transports oxygen.
9. What is the primary function of hemoglobin?
A. Destroy bacteria
B. Transport oxygen
C. Produce antibodies
D. Form blood clots
Answer: B. Transport oxygen
Rationale: Hemoglobin within red blood cells binds oxygen in the lungs and
releases it to tissues.
, 10. Which blood vessels are the primary site of exchange between blood
and tissues?
A. Arteries
B. Veins
C. Capillaries
D. Arterioles
Answer: C. Capillaries
Rationale: Capillaries have very thin walls that permit oxygen, nutrients,
carbon dioxide, and wastes to move between blood and surrounding tissues.
11. Which side of the heart pumps blood to the lungs?
A. Left side
B. Right side
C. Both sides equally
D. Neither side
Answer: B. Right side
Rationale: The right ventricle pumps deoxygenated blood through the
pulmonary artery to the lungs for oxygenation.
12. Which valve is located between the right atrium and right ventricle?
A. Mitral valve
B. Aortic valve
C. Tricuspid valve
D. Pulmonary valve
Answer: C. Tricuspid valve
Rationale: The tricuspid valve separates the right atrium from the right
ventricle and prevents backflow during ventricular contraction.
PREP 2026–2027 | 200 PRACTICE
QUESTIONS, CORRECT ANSWERS &
DETAILED RATIONALES
1. Which chamber of the heart pumps oxygenated blood into the systemic
circulation?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
Rationale: The left ventricle pumps oxygenated blood through the aorta to the
tissues of the body.
2. Which blood vessel carries deoxygenated blood from the body back to
the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Vena cava
D. Aorta
Answer: C. Vena cava
Rationale: The superior and inferior venae cavae return deoxygenated blood
from the systemic circulation to the right atrium.
3. What is the primary function of the cardiovascular system?
A. Produce hormones
B. Transport substances throughout the body
C. Digest nutrients
D. Regulate skeletal movement
,Answer: B. Transport substances throughout the body
Rationale: The cardiovascular system transports oxygen, nutrients, hormones,
carbon dioxide, and metabolic wastes throughout the body.
4. Which structure prevents blood from flowing backward from the left
ventricle into the left atrium?
A. Tricuspid valve
B. Pulmonary valve
C. Aortic valve
D. Mitral valve
Answer: D. Mitral valve
Rationale: The mitral, or bicuspid, valve lies between the left atrium and left
ventricle and prevents backflow during ventricular contraction.
5. Which vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Superior vena cava
D. Inferior vena cava
Answer: B. Pulmonary vein
Rationale: Pulmonary veins carry oxygen-rich blood from the lungs to the left
atrium.
6. Which chamber receives deoxygenated blood from the systemic
circulation?
A. Left atrium
B. Left ventricle
C. Right atrium
D. Right ventricle
Answer: C. Right atrium
,Rationale: The right atrium receives deoxygenated blood returning from the
body through the superior and inferior venae cavae.
7. What is the largest artery in the human body?
A. Pulmonary artery
B. Carotid artery
C. Aorta
D. Femoral artery
Answer: C. Aorta
Rationale: The aorta is the body's largest artery and carries oxygenated blood
from the left ventricle to systemic circulation.
8. Which blood component is primarily responsible for transporting
oxygen?
A. Platelets
B. Plasma
C. Red blood cells
D. White blood cells
Answer: C. Red blood cells
Rationale: Red blood cells contain hemoglobin, a protein that binds and
transports oxygen.
9. What is the primary function of hemoglobin?
A. Destroy bacteria
B. Transport oxygen
C. Produce antibodies
D. Form blood clots
Answer: B. Transport oxygen
Rationale: Hemoglobin within red blood cells binds oxygen in the lungs and
releases it to tissues.
, 10. Which blood vessels are the primary site of exchange between blood
and tissues?
A. Arteries
B. Veins
C. Capillaries
D. Arterioles
Answer: C. Capillaries
Rationale: Capillaries have very thin walls that permit oxygen, nutrients,
carbon dioxide, and wastes to move between blood and surrounding tissues.
11. Which side of the heart pumps blood to the lungs?
A. Left side
B. Right side
C. Both sides equally
D. Neither side
Answer: B. Right side
Rationale: The right ventricle pumps deoxygenated blood through the
pulmonary artery to the lungs for oxygenation.
12. Which valve is located between the right atrium and right ventricle?
A. Mitral valve
B. Aortic valve
C. Tricuspid valve
D. Pulmonary valve
Answer: C. Tricuspid valve
Rationale: The tricuspid valve separates the right atrium from the right
ventricle and prevents backflow during ventricular contraction.
