BIOD 151 ANATOMY AND PHYSIOLOGY I MODULE 2
RESPIRATORY SYSTEM EXAM PREP 2025/2026 | 250+
VERIFIED QUESTIONS WITH CORRECT ANSWERS &
DETAILED RATIONALES | COMPLETE STUDY GUIDE &
TEST BANK FOR GUARANTEED SUCCESS
1. What is the primary function of the respiratory system?
(A) To circulate blood
(B) To produce hormones
(C) To facilitate gas exchange
(D) To digest food
Rationale: The respiratory system's main role is to exchange oxygen and carbon
dioxide between the body and the environment.
2. Which structure is responsible for the exchange of gases in the lungs?
(A) Bronchi
(B) Alveoli
(C) Trachea
(D) Pharynx
Rationale: Alveoli are tiny air sacs where oxygen and carbon dioxide are
exchanged through diffusion.
3. What is the role of surfactant in the alveoli?
(A) Reduces surface tension
(B) Increases oxygen absorption
(C) Facilitates gas exchange
(D) Prevents infection
Rationale: Surfactant decreases surface tension in alveoli, preventing their
collapse and aiding in gas exchange.
4. Which muscle is primarily responsible for inhalation?
(A) Intercostal muscles
(B) Diaphragm
(C) Abdominal muscles
(D) Sternocleidomastoid
Rationale: The diaphragm contracts and flattens during inhalation, increasing
thoracic cavity volume and allowing air to enter the lungs.
5. What is the primary muscle used for forced expiration?
(A) Diaphragm
, (B) Abdominal muscles
(C) External intercostals
(D) Internal intercostals
Rationale: The abdominal muscles contract to push air out of the lungs during
forced expiration, increasing intrathoracic pressure.
6. How does oxygen primarily travel in the bloodstream?
(A) Dissolved in plasma
(B) Bound to hemoglobin
(C) As bicarbonate ions
(D) In leukocytes
Rationale: Most oxygen in the blood is transported bound to hemoglobin in red
blood cells, which enhances oxygen delivery to tissues.
7. What is the role of the medulla oblongata in respiration?
(A) Controls heart rate
(B) Regulates breathing rate
(C) Processes sensory information
(D) Coordinates muscle movement
Rationale: The medulla oblongata contains the respiratory centers that control
the rhythm and depth of breathing.
8. What is the primary gas exchanged during respiration?
(A) Nitrogen
(B) Oxygen and carbon dioxide
(C) Hydrogen
(D) Argon
Rationale: The primary gases exchanged in the lungs are oxygen (O2) and carbon
dioxide (CO2), which are critical for cellular respiration.
9. What is the significance of the respiratory membrane?
(A) Provides structure to the lungs
(B) Facilitates gas exchange
(C) Prevents infections
(D) Produces surfactant
Rationale: The respiratory membrane's thin structure allows for efficient gas
exchange between alveoli and capillaries.
,10. Which part of the respiratory system filters, warms, and humidifies incoming
air?
(A) Lungs
(B) Nasal cavity
(C) Alveoli
(D) Bronchi
Rationale: The nasal cavity conditions the air before it reaches the lungs,
enhancing respiratory efficiency.
11. What happens during the process of external respiration?
(A) Oxygen is used by cells
(B) Gas exchange occurs in the lungs
(C) Carbon dioxide is produced
(D) Air is exhaled
Rationale: External respiration refers to the exchange of gases between the air in
the alveoli and the blood in the capillaries.
12. What is the function of the epiglottis?
(A) Prevents food from entering the trachea
(B) Aids in sound production
(C) Filters air
(D) Produces mucus
Rationale: The epiglottis covers the trachea during swallowing, preventing food
and liquids from entering the airway.
13. What term describes the amount of air that can be forcibly exhaled after a
normal exhalation?
(A) Tidal volume
(B) Expiratory reserve volume
(C) Vital capacity
(D) Residual volume
Rationale: Expiratory reserve volume is the additional air that can be exhaled
beyond the normal tidal volume.
14. Which respiratory condition is characterized by chronic inflammation of the
airways?
(A) Asthma
(B) Chronic bronchitis
(C) Emphysema
(D) Pneumonia
, Rationale: Chronic bronchitis involves long-term inflammation of the bronchi,
leading to coughing and mucus production.
15. What does a spirometer measure?
(A) Blood oxygen levels
(B) Lung volumes and capacities
(C) Airway resistance
(D) Carbon dioxide levels
Rationale: A spirometer is used to measure various lung volumes, assisting in
the assessment of respiratory function.
16. What is the impact of carbon dioxide on blood pH?
(A) Decreases pH (makes it more acidic)
(B) Increases pH (makes it more alkaline)
(C) Has no effect
(D) Stabilizes pH
Rationale: Increased carbon dioxide levels lead to the formation of carbonic
acid, lowering blood pH and causing acidosis.
17. What is the primary function of the bronchial tree?
(A) Conduct air to the lungs
(B) Exchange gases
(C) Produce mucus
(D) Protect against infection
Rationale: The bronchial tree is responsible for conducting air from the trachea
into the lungs.
18. What is the term for the volume of air inhaled or exhaled during normal
breathing?
(A) Residual volume
(B) Tidal volume
(C) Vital capacity
(D) Inspiratory reserve volume
Rationale: Tidal volume is the amount of air moved in and out of the lungs during
regular, unforced breathing.
19. Which structure divides the thoracic cavity from the abdominal cavity?
(A) Intercostal muscles
(B) Diaphragm
RESPIRATORY SYSTEM EXAM PREP 2025/2026 | 250+
VERIFIED QUESTIONS WITH CORRECT ANSWERS &
DETAILED RATIONALES | COMPLETE STUDY GUIDE &
TEST BANK FOR GUARANTEED SUCCESS
1. What is the primary function of the respiratory system?
(A) To circulate blood
(B) To produce hormones
(C) To facilitate gas exchange
(D) To digest food
Rationale: The respiratory system's main role is to exchange oxygen and carbon
dioxide between the body and the environment.
2. Which structure is responsible for the exchange of gases in the lungs?
(A) Bronchi
(B) Alveoli
(C) Trachea
(D) Pharynx
Rationale: Alveoli are tiny air sacs where oxygen and carbon dioxide are
exchanged through diffusion.
3. What is the role of surfactant in the alveoli?
(A) Reduces surface tension
(B) Increases oxygen absorption
(C) Facilitates gas exchange
(D) Prevents infection
Rationale: Surfactant decreases surface tension in alveoli, preventing their
collapse and aiding in gas exchange.
4. Which muscle is primarily responsible for inhalation?
(A) Intercostal muscles
(B) Diaphragm
(C) Abdominal muscles
(D) Sternocleidomastoid
Rationale: The diaphragm contracts and flattens during inhalation, increasing
thoracic cavity volume and allowing air to enter the lungs.
5. What is the primary muscle used for forced expiration?
(A) Diaphragm
, (B) Abdominal muscles
(C) External intercostals
(D) Internal intercostals
Rationale: The abdominal muscles contract to push air out of the lungs during
forced expiration, increasing intrathoracic pressure.
6. How does oxygen primarily travel in the bloodstream?
(A) Dissolved in plasma
(B) Bound to hemoglobin
(C) As bicarbonate ions
(D) In leukocytes
Rationale: Most oxygen in the blood is transported bound to hemoglobin in red
blood cells, which enhances oxygen delivery to tissues.
7. What is the role of the medulla oblongata in respiration?
(A) Controls heart rate
(B) Regulates breathing rate
(C) Processes sensory information
(D) Coordinates muscle movement
Rationale: The medulla oblongata contains the respiratory centers that control
the rhythm and depth of breathing.
8. What is the primary gas exchanged during respiration?
(A) Nitrogen
(B) Oxygen and carbon dioxide
(C) Hydrogen
(D) Argon
Rationale: The primary gases exchanged in the lungs are oxygen (O2) and carbon
dioxide (CO2), which are critical for cellular respiration.
9. What is the significance of the respiratory membrane?
(A) Provides structure to the lungs
(B) Facilitates gas exchange
(C) Prevents infections
(D) Produces surfactant
Rationale: The respiratory membrane's thin structure allows for efficient gas
exchange between alveoli and capillaries.
,10. Which part of the respiratory system filters, warms, and humidifies incoming
air?
(A) Lungs
(B) Nasal cavity
(C) Alveoli
(D) Bronchi
Rationale: The nasal cavity conditions the air before it reaches the lungs,
enhancing respiratory efficiency.
11. What happens during the process of external respiration?
(A) Oxygen is used by cells
(B) Gas exchange occurs in the lungs
(C) Carbon dioxide is produced
(D) Air is exhaled
Rationale: External respiration refers to the exchange of gases between the air in
the alveoli and the blood in the capillaries.
12. What is the function of the epiglottis?
(A) Prevents food from entering the trachea
(B) Aids in sound production
(C) Filters air
(D) Produces mucus
Rationale: The epiglottis covers the trachea during swallowing, preventing food
and liquids from entering the airway.
13. What term describes the amount of air that can be forcibly exhaled after a
normal exhalation?
(A) Tidal volume
(B) Expiratory reserve volume
(C) Vital capacity
(D) Residual volume
Rationale: Expiratory reserve volume is the additional air that can be exhaled
beyond the normal tidal volume.
14. Which respiratory condition is characterized by chronic inflammation of the
airways?
(A) Asthma
(B) Chronic bronchitis
(C) Emphysema
(D) Pneumonia
, Rationale: Chronic bronchitis involves long-term inflammation of the bronchi,
leading to coughing and mucus production.
15. What does a spirometer measure?
(A) Blood oxygen levels
(B) Lung volumes and capacities
(C) Airway resistance
(D) Carbon dioxide levels
Rationale: A spirometer is used to measure various lung volumes, assisting in
the assessment of respiratory function.
16. What is the impact of carbon dioxide on blood pH?
(A) Decreases pH (makes it more acidic)
(B) Increases pH (makes it more alkaline)
(C) Has no effect
(D) Stabilizes pH
Rationale: Increased carbon dioxide levels lead to the formation of carbonic
acid, lowering blood pH and causing acidosis.
17. What is the primary function of the bronchial tree?
(A) Conduct air to the lungs
(B) Exchange gases
(C) Produce mucus
(D) Protect against infection
Rationale: The bronchial tree is responsible for conducting air from the trachea
into the lungs.
18. What is the term for the volume of air inhaled or exhaled during normal
breathing?
(A) Residual volume
(B) Tidal volume
(C) Vital capacity
(D) Inspiratory reserve volume
Rationale: Tidal volume is the amount of air moved in and out of the lungs during
regular, unforced breathing.
19. Which structure divides the thoracic cavity from the abdominal cavity?
(A) Intercostal muscles
(B) Diaphragm
