BIOD 151 Module 2: Exam Portage Learning Questions and Answers 2026
Practice Set
Section 1: Respiratory Anatomy
1. Which structure is known as the "Guardian of the Airways"?
A. Thyroid cartilage
B. Cricoid cartilage
C. Epiglottis
D. Glottis
Rationale: The epiglottis is a flap of elastic cartilage that covers the opening
of the larynx during swallowing. This directs food into the esophagus and
prevents it from entering the trachea (aspiration).
2. The "Adam’s Apple" is the clinical name for the prominence of which
cartilage?
A. Cricoid
B. Thyroid
C. Arytenoid
D. Cuneiform
Rationale: The thyroid cartilage is the largest laryngeal cartilage. Its anterior
protrusion, the laryngeal prominence, is typically more visible in males due
to the influence of testosterone during puberty.
3. What is the correct sequence of the pharyngeal regions from superior to
inferior?
A. Oropharynx, Nasopharynx, Laryngopharynx
B. Nasopharynx, Oropharynx, Laryngopharynx
C. Laryngopharynx, Oropharynx, Nasopharynx
D. Nasopharynx, Laryngopharynx, Oropharynx
Rationale: The nasopharynx sits posterior to the nasal cavity, the
oropharynx sits posterior to the oral cavity, and the laryngopharynx is the
most inferior portion leading to the larynx.
4. The trachea is reinforced with "C-shaped" rings made of which tissue?
A. Elastic cartilage
, B. Hyaline cartilage
C. Fibrocartilage
D. Bone
Rationale: Hyaline cartilage provides the rigid support necessary to keep
the airway open (patent) despite pressure changes. The "C" shape allows
the esophagus to expand forward during swallowing.
5. Which lung is characterized by having three lobes and no cardiac notch?
A. Right Lung
B. Left Lung
C. Both Lungs
D. Neither Lung
Rationale: The right lung is larger and divided into three lobes (superior,
middle, inferior). The left lung has only two lobes to accommodate the
heart, which creates the indentation known as the cardiac notch.
Section 2: The Bronchial Tree & Alveoli
6. What is the final structure of the "Conducting Zone"?
A. Respiratory bronchioles
B. Alveolar ducts
C. Terminal bronchioles
D. Segmental bronchi
Rationale: The conducting zone consists of all the structures that move, warm,
and filter air but do not perform gas exchange. It ends at the terminal
bronchioles; the respiratory zone begins immediately after.
7. Which cell type produces "Surfactant" to prevent alveolar collapse?
A. Type I Alveolar cells
B. Type II Alveolar cells
C. Alveolar Macrophages
D. Goblet cells
Rationale: Type II alveolar cells (septal cells) secrete surfactant, a phospholipid
film that reduces surface tension. This prevents the "wet" walls of the alveoli
from sticking together and collapsing during exhalation.
8. The "Respiratory Membrane" (Air-Blood Barrier) consists primarily of:
A. Ciliated cells and mucus
, B. Simple squamous epithelium and capillary endothelium
C. Smooth muscle and elastic fibers
D. The parietal and visceral pleurae
Rationale: To allow for rapid diffusion of gases, the membrane must be incredibly
thin. It is composed of the alveolar squamous cells and the capillary endothelial
cells sharing a fused basement membrane.
9. As air travels deeper into the bronchial tree, what structural change
occurs?
A. Cartilage increases and smooth muscle decreases
B. Cartilage decreases and smooth muscle increases
C. Both decrease
D. Both increase
Rationale: Large bronchi require cartilage for support. As tubes become smaller
(bronchioles), cartilage disappears and is replaced by smooth muscle, allowing
for the regulation of airflow (bronchodilation/constriction).
10. "Dust Cells" found in the alveoli are technically:
A. Epithelial cells
B. Goblet cells
C. Alveolar Macrophages
D. Red blood cells
Rationale: Alveolar macrophages are the last line of defense in the lungs. Since
the alveoli lack cilia, these cells wander the surface to phagocytize (eat) any
bacteria or debris that reached the deep lungs.
Section 3: Mechanics of Ventilation
11. Boyle’s Law states that if the volume of the thoracic cavity increases, the
pressure:
A. Increases
B. Decreases
C. Stays the same
D. Disappears
Rationale: Pressure and volume are inversely proportional. When the diaphragm
contracts and increases the lung volume, the internal pressure drops below
atmospheric pressure, creating a vacuum that pulls air in.
Practice Set
Section 1: Respiratory Anatomy
1. Which structure is known as the "Guardian of the Airways"?
A. Thyroid cartilage
B. Cricoid cartilage
C. Epiglottis
D. Glottis
Rationale: The epiglottis is a flap of elastic cartilage that covers the opening
of the larynx during swallowing. This directs food into the esophagus and
prevents it from entering the trachea (aspiration).
2. The "Adam’s Apple" is the clinical name for the prominence of which
cartilage?
A. Cricoid
B. Thyroid
C. Arytenoid
D. Cuneiform
Rationale: The thyroid cartilage is the largest laryngeal cartilage. Its anterior
protrusion, the laryngeal prominence, is typically more visible in males due
to the influence of testosterone during puberty.
3. What is the correct sequence of the pharyngeal regions from superior to
inferior?
A. Oropharynx, Nasopharynx, Laryngopharynx
B. Nasopharynx, Oropharynx, Laryngopharynx
C. Laryngopharynx, Oropharynx, Nasopharynx
D. Nasopharynx, Laryngopharynx, Oropharynx
Rationale: The nasopharynx sits posterior to the nasal cavity, the
oropharynx sits posterior to the oral cavity, and the laryngopharynx is the
most inferior portion leading to the larynx.
4. The trachea is reinforced with "C-shaped" rings made of which tissue?
A. Elastic cartilage
, B. Hyaline cartilage
C. Fibrocartilage
D. Bone
Rationale: Hyaline cartilage provides the rigid support necessary to keep
the airway open (patent) despite pressure changes. The "C" shape allows
the esophagus to expand forward during swallowing.
5. Which lung is characterized by having three lobes and no cardiac notch?
A. Right Lung
B. Left Lung
C. Both Lungs
D. Neither Lung
Rationale: The right lung is larger and divided into three lobes (superior,
middle, inferior). The left lung has only two lobes to accommodate the
heart, which creates the indentation known as the cardiac notch.
Section 2: The Bronchial Tree & Alveoli
6. What is the final structure of the "Conducting Zone"?
A. Respiratory bronchioles
B. Alveolar ducts
C. Terminal bronchioles
D. Segmental bronchi
Rationale: The conducting zone consists of all the structures that move, warm,
and filter air but do not perform gas exchange. It ends at the terminal
bronchioles; the respiratory zone begins immediately after.
7. Which cell type produces "Surfactant" to prevent alveolar collapse?
A. Type I Alveolar cells
B. Type II Alveolar cells
C. Alveolar Macrophages
D. Goblet cells
Rationale: Type II alveolar cells (septal cells) secrete surfactant, a phospholipid
film that reduces surface tension. This prevents the "wet" walls of the alveoli
from sticking together and collapsing during exhalation.
8. The "Respiratory Membrane" (Air-Blood Barrier) consists primarily of:
A. Ciliated cells and mucus
, B. Simple squamous epithelium and capillary endothelium
C. Smooth muscle and elastic fibers
D. The parietal and visceral pleurae
Rationale: To allow for rapid diffusion of gases, the membrane must be incredibly
thin. It is composed of the alveolar squamous cells and the capillary endothelial
cells sharing a fused basement membrane.
9. As air travels deeper into the bronchial tree, what structural change
occurs?
A. Cartilage increases and smooth muscle decreases
B. Cartilage decreases and smooth muscle increases
C. Both decrease
D. Both increase
Rationale: Large bronchi require cartilage for support. As tubes become smaller
(bronchioles), cartilage disappears and is replaced by smooth muscle, allowing
for the regulation of airflow (bronchodilation/constriction).
10. "Dust Cells" found in the alveoli are technically:
A. Epithelial cells
B. Goblet cells
C. Alveolar Macrophages
D. Red blood cells
Rationale: Alveolar macrophages are the last line of defense in the lungs. Since
the alveoli lack cilia, these cells wander the surface to phagocytize (eat) any
bacteria or debris that reached the deep lungs.
Section 3: Mechanics of Ventilation
11. Boyle’s Law states that if the volume of the thoracic cavity increases, the
pressure:
A. Increases
B. Decreases
C. Stays the same
D. Disappears
Rationale: Pressure and volume are inversely proportional. When the diaphragm
contracts and increases the lung volume, the internal pressure drops below
atmospheric pressure, creating a vacuum that pulls air in.
