Beachey’s Respiratory Care Anatomy and
Physiology 3rd Edition | Complete Test Bank |
Verified A+ Questions, Answers, & Rationales |
2025–2026 Updated Respiratory Review
Master the complexities of the respiratory system with this comprehensive test bank for
Beachey’s Respiratory Care Anatomy and Physiology (3rd Ed). This resource features 300+
exam-style questions covering ABGs, ventilation-perfusion, mechanics of breathing, and acid-
base balance. Each entry includes bolded answers and italicized rationales to ensure deep
understanding of clinical concepts. Perfect for RT and Nursing students prepping for TMC or
ATI exams. Updated for 2025-2026!
1. Which of the following structures constitutes the primary site of gas exchange in the
respiratory system?
A. Respiratory bronchioles
B. Terminal bronchioles
C. Alveoli
D. Alveolar ducts
Rationale: The alveoli are the terminal ends of the respiratory tract where the blood-air barrier
exists, allowing for the diffusion of oxygen and carbon dioxide.
2. According to Boyle’s Law, as the volume of the thoracic cavity increases during inspiration, the
intrapulmonary pressure:
A. Increases
B. Decreases
C. Remains constant
D. Equalizes with atmospheric pressure
Rationale: Boyle’s Law states that pressure and volume are inversely proportional; as volume
expands, pressure drops, drawing air into the lungs.
3. Which muscle is considered the primary muscle of inspiration, responsible for approximately
75% of air movement during quiet breathing?
A. External intercostals
B. Sternocleidomastoid
C. Diaphragm
D. Scalenes
,Rationale: The diaphragm is the most essential inspiratory muscle; its contraction increases the
vertical dimension of the thoracic cavity.
4. What is the anatomical term for the point where the trachea bifurcates into the right and left
mainstem bronchi?
A. Glottis
B. Carina
C. Epiglottis
D. Vallecula
Rationale: The carina is the cartilaginous ridge at the base of the trachea. It is highly sensitive
and triggers a cough reflex when touched by a suction catheter.
5. A patient has a diminished production of Type II alveolar cells. Which of the following
complications should the nurse/therapist anticipate?
A. Increased lung compliance
B. Alveolar collapse (atelectasis)
C. Excessive mucus production
D. Increased vital capacity
Rationale: Type II cells produce surfactant, which reduces surface tension; without it, alveoli
tend to collapse.
6. Which nerve provides the primary motor innervation to the diaphragm?
A. Vagus nerve
B. Phrenic nerve
C. Intercostal nerve
D. Glossopharyngeal nerve
Rationale: The phrenic nerve (arising from C3-C5) is responsible for diaphragmatic contraction.
"C3, 4, 5 keep the diaphragm alive."
7. In the presence of high carbon dioxide levels (hypercapnia), the central chemoreceptors in
the medulla will trigger:
A. A decrease in heart rate
B. An increase in rate and depth of breathing
C. Bronchoconstriction
D. Hypoventilation
Rationale: Central chemoreceptors respond to changes in pH and CO2 in the cerebrospinal fluid,
stimulating increased ventilation to blow off excess CO2.
8. Which of the following represents the volume of air remaining in the lungs after a maximal
exhalation?
,A. Tidal volume
B. Functional residual capacity
C. Residual volume
D. Expiratory reserve volume
Rationale: Residual volume (RV) cannot be exhaled; it stays in the lungs to keep the alveoli open
and provide continuous gas exchange.
9. The majority of oxygen in the blood is transported in which form?
A. Dissolved in plasma
B. Bound to hemoglobin
C. As bicarbonate ions
D. Bound to plasma proteins
Rationale: About 97-98% of oxygen is carried by hemoglobin; only a tiny fraction (0.003 mL per
100 mL of blood) is dissolved in plasma.
10. A "right shift" in the oxyhemoglobin dissociation curve indicates:
A. Increased affinity of hemoglobin for oxygen
B. Increased oxygen unloading to the tissues
C. Decreased body temperature
D. Alkalosis
Rationale: A right shift (caused by high CO2, high temperature, or low pH) means hemoglobin
has a lower affinity for oxygen and releases it more easily to tissues.
11. Which anatomical structure prevents food and liquid from entering the larynx during
swallowing?
A. Soft palate
B. Epiglottis
C. Uvula
D. Thyroid cartilage
Rationale: The epiglottis is a leaf-shaped flap that folds over the glottis during swallowing to
protect the airway.
12. The pores of Kohn serve which of the following functions?
A. Secretion of mucus
B. Collateral ventilation between alveoli
C. Phagocytosis of dust particles
D. Warming inspired air
Rationale: The pores of Kohn are small openings in the alveolar walls that allow air to move
between adjacent alveoli, helping to equalize pressure.
, 13. Which component of the respiratory membrane is responsible for moving mucus toward
the pharynx?
A. Goblet cells
B. Cilia
C. Alveolar macrophages
D. Surfactant
Rationale: The "mucociliary escalator" uses cilia to beat upward, moving trapped debris and
mucus out of the lower respiratory tract.
14. During a physical assessment, the nurse notes "Stridor." This sound most likely indicates:
A. Fluid in the lower alveoli
B. Upper airway obstruction
C. Bronchospasm in the bronchioles
D. Pleural friction rub
Rationale: Stridor is a high-pitched, crowing sound heard on inspiration, signifying narrowing of
the larynx or trachea.
15. What is the normal pH range for arterial blood?
A. 7.00 – 7.15
B. 7.25 – 7.35
C. 7.35 – 7.45
D. 7.45 – 7.55
Rationale: The human body maintains a tight homeostatic range for arterial pH between 7.35
and 7.45.
16. Which of the following values represents a normal PaCO2?
A. 22 – 26 mmHg
B. 35 – 45 mmHg
C. 80 – 100 mmHg
D. 12 – 16 mmHg
Rationale: The partial pressure of carbon dioxide (PaCO2) in arterial blood is normally 35 to 45
mmHg.
17. The Haldane Effect describes the relationship between:
A. Oxygen and hemoglobin affinity
B. Oxygen levels and the ability of blood to carry CO2
C. pH and respiratory rate
D. Surface tension and alveolar diameter
Rationale: The Haldane Effect states that deoxygenated blood has an increased ability to carry
CO2, facilitating CO2 pickup in the tissues.
Physiology 3rd Edition | Complete Test Bank |
Verified A+ Questions, Answers, & Rationales |
2025–2026 Updated Respiratory Review
Master the complexities of the respiratory system with this comprehensive test bank for
Beachey’s Respiratory Care Anatomy and Physiology (3rd Ed). This resource features 300+
exam-style questions covering ABGs, ventilation-perfusion, mechanics of breathing, and acid-
base balance. Each entry includes bolded answers and italicized rationales to ensure deep
understanding of clinical concepts. Perfect for RT and Nursing students prepping for TMC or
ATI exams. Updated for 2025-2026!
1. Which of the following structures constitutes the primary site of gas exchange in the
respiratory system?
A. Respiratory bronchioles
B. Terminal bronchioles
C. Alveoli
D. Alveolar ducts
Rationale: The alveoli are the terminal ends of the respiratory tract where the blood-air barrier
exists, allowing for the diffusion of oxygen and carbon dioxide.
2. According to Boyle’s Law, as the volume of the thoracic cavity increases during inspiration, the
intrapulmonary pressure:
A. Increases
B. Decreases
C. Remains constant
D. Equalizes with atmospheric pressure
Rationale: Boyle’s Law states that pressure and volume are inversely proportional; as volume
expands, pressure drops, drawing air into the lungs.
3. Which muscle is considered the primary muscle of inspiration, responsible for approximately
75% of air movement during quiet breathing?
A. External intercostals
B. Sternocleidomastoid
C. Diaphragm
D. Scalenes
,Rationale: The diaphragm is the most essential inspiratory muscle; its contraction increases the
vertical dimension of the thoracic cavity.
4. What is the anatomical term for the point where the trachea bifurcates into the right and left
mainstem bronchi?
A. Glottis
B. Carina
C. Epiglottis
D. Vallecula
Rationale: The carina is the cartilaginous ridge at the base of the trachea. It is highly sensitive
and triggers a cough reflex when touched by a suction catheter.
5. A patient has a diminished production of Type II alveolar cells. Which of the following
complications should the nurse/therapist anticipate?
A. Increased lung compliance
B. Alveolar collapse (atelectasis)
C. Excessive mucus production
D. Increased vital capacity
Rationale: Type II cells produce surfactant, which reduces surface tension; without it, alveoli
tend to collapse.
6. Which nerve provides the primary motor innervation to the diaphragm?
A. Vagus nerve
B. Phrenic nerve
C. Intercostal nerve
D. Glossopharyngeal nerve
Rationale: The phrenic nerve (arising from C3-C5) is responsible for diaphragmatic contraction.
"C3, 4, 5 keep the diaphragm alive."
7. In the presence of high carbon dioxide levels (hypercapnia), the central chemoreceptors in
the medulla will trigger:
A. A decrease in heart rate
B. An increase in rate and depth of breathing
C. Bronchoconstriction
D. Hypoventilation
Rationale: Central chemoreceptors respond to changes in pH and CO2 in the cerebrospinal fluid,
stimulating increased ventilation to blow off excess CO2.
8. Which of the following represents the volume of air remaining in the lungs after a maximal
exhalation?
,A. Tidal volume
B. Functional residual capacity
C. Residual volume
D. Expiratory reserve volume
Rationale: Residual volume (RV) cannot be exhaled; it stays in the lungs to keep the alveoli open
and provide continuous gas exchange.
9. The majority of oxygen in the blood is transported in which form?
A. Dissolved in plasma
B. Bound to hemoglobin
C. As bicarbonate ions
D. Bound to plasma proteins
Rationale: About 97-98% of oxygen is carried by hemoglobin; only a tiny fraction (0.003 mL per
100 mL of blood) is dissolved in plasma.
10. A "right shift" in the oxyhemoglobin dissociation curve indicates:
A. Increased affinity of hemoglobin for oxygen
B. Increased oxygen unloading to the tissues
C. Decreased body temperature
D. Alkalosis
Rationale: A right shift (caused by high CO2, high temperature, or low pH) means hemoglobin
has a lower affinity for oxygen and releases it more easily to tissues.
11. Which anatomical structure prevents food and liquid from entering the larynx during
swallowing?
A. Soft palate
B. Epiglottis
C. Uvula
D. Thyroid cartilage
Rationale: The epiglottis is a leaf-shaped flap that folds over the glottis during swallowing to
protect the airway.
12. The pores of Kohn serve which of the following functions?
A. Secretion of mucus
B. Collateral ventilation between alveoli
C. Phagocytosis of dust particles
D. Warming inspired air
Rationale: The pores of Kohn are small openings in the alveolar walls that allow air to move
between adjacent alveoli, helping to equalize pressure.
, 13. Which component of the respiratory membrane is responsible for moving mucus toward
the pharynx?
A. Goblet cells
B. Cilia
C. Alveolar macrophages
D. Surfactant
Rationale: The "mucociliary escalator" uses cilia to beat upward, moving trapped debris and
mucus out of the lower respiratory tract.
14. During a physical assessment, the nurse notes "Stridor." This sound most likely indicates:
A. Fluid in the lower alveoli
B. Upper airway obstruction
C. Bronchospasm in the bronchioles
D. Pleural friction rub
Rationale: Stridor is a high-pitched, crowing sound heard on inspiration, signifying narrowing of
the larynx or trachea.
15. What is the normal pH range for arterial blood?
A. 7.00 – 7.15
B. 7.25 – 7.35
C. 7.35 – 7.45
D. 7.45 – 7.55
Rationale: The human body maintains a tight homeostatic range for arterial pH between 7.35
and 7.45.
16. Which of the following values represents a normal PaCO2?
A. 22 – 26 mmHg
B. 35 – 45 mmHg
C. 80 – 100 mmHg
D. 12 – 16 mmHg
Rationale: The partial pressure of carbon dioxide (PaCO2) in arterial blood is normally 35 to 45
mmHg.
17. The Haldane Effect describes the relationship between:
A. Oxygen and hemoglobin affinity
B. Oxygen levels and the ability of blood to carry CO2
C. pH and respiratory rate
D. Surface tension and alveolar diameter
Rationale: The Haldane Effect states that deoxygenated blood has an increased ability to carry
CO2, facilitating CO2 pickup in the tissues.
