BSN Week 4 Quiz: Cardiovascular & Respiratory Systems 2026|Galen
College
1. Which heart chamber is responsible for pumping oxygenated blood into the
systemic circulation via the aorta?
A. Right Atrium
B. Left Ventricle
C. Left Atrium
D. Right Ventricle
Answer: B
Rationale: The left ventricle is the thickest chamber and pumps oxygenated blood through
the aortic valve into the aorta for systemic distribution.
2. Which valve prevents the backflow of blood from the right ventricle into the
right atrium?
A. Mitral Valve
B. Tricuspid Valve
C. Pulmonary Valve
D. Aortic Valve
Answer: B
Rationale: The tricuspid valve is the atrioventricular valve located between the right
atrium and the right ventricle.
,3. What is the primary pacemaker of the heart, normally initiating electrical
impulses at 60-100 beats per minute?
A. AV Node
B. Bundle of His
C. SA Node
D. Purkinje Fibers
Answer: C
Rationale: The Sinoatrial (SA) node is the natural pacemaker of the heart located in the
right atrium.
4. In the cardiac cycle, the period of ventricular contraction and blood ejection is
known as:
A. Diastole
B. Systole
C. Preload
D. Afterload
Answer: B
Rationale: Systole refers to the phase of the heartbeat when the heart muscle contracts
and pumps blood from the chambers into the arteries.
5. Which clinical finding is most characteristic of right-sided heart failure?
A. Peripheral edema
B. Orthopnea
C. Pulmonary crackles
D. Frothy pink sputum
Answer: A
Rationale: Right-sided heart failure causes blood to back up into the systemic venous
system, leading to peripheral edema and jugular venous distention.
, 6. During auscultation of the lungs, a nurse hears high-pitched, musical sounds
primarily during expiration. This is documented as:
A. Crackles
B. Pleural friction rub
C. Rhonchi
D. Wheezes
Answer: D
Rationale: Wheezes are continuous, high-pitched musical sounds caused by air flowing
through narrowed or obstructed airways.
7. Where is the primary site of gas exchange within the lungs?
A. Bronchioles
B. Alveoli
C. Trachea
D. Pleural space
Answer: B
Rationale: The alveoli are tiny air sacs where oxygen and carbon dioxide are exchanged
between the lungs and the blood.
8. Which factor is the strongest stimulus for breathing in a healthy individual?
A. Low oxygen levels
B. High pH levels
C. Low blood pressure
D. High carbon dioxide levels
Answer: D
Rationale: In healthy individuals, the central chemoreceptors are most sensitive to
changes in PaCO2 and pH in the cerebrospinal fluid.
College
1. Which heart chamber is responsible for pumping oxygenated blood into the
systemic circulation via the aorta?
A. Right Atrium
B. Left Ventricle
C. Left Atrium
D. Right Ventricle
Answer: B
Rationale: The left ventricle is the thickest chamber and pumps oxygenated blood through
the aortic valve into the aorta for systemic distribution.
2. Which valve prevents the backflow of blood from the right ventricle into the
right atrium?
A. Mitral Valve
B. Tricuspid Valve
C. Pulmonary Valve
D. Aortic Valve
Answer: B
Rationale: The tricuspid valve is the atrioventricular valve located between the right
atrium and the right ventricle.
,3. What is the primary pacemaker of the heart, normally initiating electrical
impulses at 60-100 beats per minute?
A. AV Node
B. Bundle of His
C. SA Node
D. Purkinje Fibers
Answer: C
Rationale: The Sinoatrial (SA) node is the natural pacemaker of the heart located in the
right atrium.
4. In the cardiac cycle, the period of ventricular contraction and blood ejection is
known as:
A. Diastole
B. Systole
C. Preload
D. Afterload
Answer: B
Rationale: Systole refers to the phase of the heartbeat when the heart muscle contracts
and pumps blood from the chambers into the arteries.
5. Which clinical finding is most characteristic of right-sided heart failure?
A. Peripheral edema
B. Orthopnea
C. Pulmonary crackles
D. Frothy pink sputum
Answer: A
Rationale: Right-sided heart failure causes blood to back up into the systemic venous
system, leading to peripheral edema and jugular venous distention.
, 6. During auscultation of the lungs, a nurse hears high-pitched, musical sounds
primarily during expiration. This is documented as:
A. Crackles
B. Pleural friction rub
C. Rhonchi
D. Wheezes
Answer: D
Rationale: Wheezes are continuous, high-pitched musical sounds caused by air flowing
through narrowed or obstructed airways.
7. Where is the primary site of gas exchange within the lungs?
A. Bronchioles
B. Alveoli
C. Trachea
D. Pleural space
Answer: B
Rationale: The alveoli are tiny air sacs where oxygen and carbon dioxide are exchanged
between the lungs and the blood.
8. Which factor is the strongest stimulus for breathing in a healthy individual?
A. Low oxygen levels
B. High pH levels
C. Low blood pressure
D. High carbon dioxide levels
Answer: D
Rationale: In healthy individuals, the central chemoreceptors are most sensitive to
changes in PaCO2 and pH in the cerebrospinal fluid.
