DAANCE Sedation and Anesthesia Exam
Questions and Verified Answers with
Rationale Latest Edition 2026/2027
Module 1: Anatomy of the Airway and Respiratory
Physiology
The upper airway consists of all the following structures
except the:
A. Nasal cavity
B. Pharynx
C. Larynx
D. Trachea
Correct Answer: D
Rationale: The upper airway typically includes the nasal
cavity, oral cavity, pharynx, and larynx down to the vocal
cords. The trachea marks the beginning of the lower
respiratory tract.
Which anatomical structure forms the dividing landmark
between the upper and lower respiratory tracts?
A. Epiglottis
B. Vocal cords (glottis)
C. Carina
,D. Cricoid cartilage
Correct Answer: B
Rationale: The vocal cords, located within the larynx at the
glottis, serve as the anatomical boundary separating the
upper and lower airways.
The primary muscle responsible for active inspiration during
normal breathing is the:
A. Intercostal muscle
B. Sternocleidomastoid
C. Diaphragm
D. Pectoralis minor
Correct Answer: C
Rationale: The diaphragm is the primary dome-shaped
skeletal muscle that flattens and contracts downward during
inspiration, creating negative thoracic pressure to pull air
into the lungs.
The anatomical landmark where the trachea bifurcates into the
left and right mainstem bronchi is called the:
A. Glottis
B. Carina
C. Hyoid bone
,D. Vallecula
Correct Answer: B
Rationale: The carina is the ridge at the base of the trachea
where it branches into the left and right mainstem bronchi,
highly sensitive and capable of triggering a vigorous cough
reflex.
Dead space ventilation refers to the volume of inspired air
that:
A. Reaches the alveoli for gas exchange
B. Remains in the conducting airways and does not participate
in gas exchange
C. Is exhaled during a forced expiration
D. Is trapped in the pleural cavity during a pneumothorax
Correct Answer: B
Rationale: Anatomical dead space consists of the air
occupying the nose, pharynx, trachea, and bronchi where
no gas exchange occurs, typically measuring about 150 mL
in an adult.
The structure located behind the root of the tongue that forms
a depression acting as a landmark during direct
laryngoscopy is the:
A. Uvula
B. Vallecula
, C. Tonsillar pillar
D. Thyroid notch
Correct Answer: B
Rationale: The vallecula is the space between the base of the
tongue and the epiglottis, serving as the placement site for
the tip of a Macintosh laryngoscope blade during
intubation.
Which cartilage of the larynx forms a complete, signet-ring-
shaped circle providing structural support immediately
below the vocal cords?
A. Thyroid cartilage
B. Cricoid cartilage
C. Arytenoid cartilage
D. Epiglottic cartilage
Correct Answer: B
Rationale: The cricoid cartilage is the only complete
cartilaginous ring in the airway, making cricoid pressure a
historical technique used to compress the esophagus and
prevent regurgitation.
The primary driving force for passive exhalation during
normal quiet breathing is:
A. Contraction of abdominal wall muscles
Questions and Verified Answers with
Rationale Latest Edition 2026/2027
Module 1: Anatomy of the Airway and Respiratory
Physiology
The upper airway consists of all the following structures
except the:
A. Nasal cavity
B. Pharynx
C. Larynx
D. Trachea
Correct Answer: D
Rationale: The upper airway typically includes the nasal
cavity, oral cavity, pharynx, and larynx down to the vocal
cords. The trachea marks the beginning of the lower
respiratory tract.
Which anatomical structure forms the dividing landmark
between the upper and lower respiratory tracts?
A. Epiglottis
B. Vocal cords (glottis)
C. Carina
,D. Cricoid cartilage
Correct Answer: B
Rationale: The vocal cords, located within the larynx at the
glottis, serve as the anatomical boundary separating the
upper and lower airways.
The primary muscle responsible for active inspiration during
normal breathing is the:
A. Intercostal muscle
B. Sternocleidomastoid
C. Diaphragm
D. Pectoralis minor
Correct Answer: C
Rationale: The diaphragm is the primary dome-shaped
skeletal muscle that flattens and contracts downward during
inspiration, creating negative thoracic pressure to pull air
into the lungs.
The anatomical landmark where the trachea bifurcates into the
left and right mainstem bronchi is called the:
A. Glottis
B. Carina
C. Hyoid bone
,D. Vallecula
Correct Answer: B
Rationale: The carina is the ridge at the base of the trachea
where it branches into the left and right mainstem bronchi,
highly sensitive and capable of triggering a vigorous cough
reflex.
Dead space ventilation refers to the volume of inspired air
that:
A. Reaches the alveoli for gas exchange
B. Remains in the conducting airways and does not participate
in gas exchange
C. Is exhaled during a forced expiration
D. Is trapped in the pleural cavity during a pneumothorax
Correct Answer: B
Rationale: Anatomical dead space consists of the air
occupying the nose, pharynx, trachea, and bronchi where
no gas exchange occurs, typically measuring about 150 mL
in an adult.
The structure located behind the root of the tongue that forms
a depression acting as a landmark during direct
laryngoscopy is the:
A. Uvula
B. Vallecula
, C. Tonsillar pillar
D. Thyroid notch
Correct Answer: B
Rationale: The vallecula is the space between the base of the
tongue and the epiglottis, serving as the placement site for
the tip of a Macintosh laryngoscope blade during
intubation.
Which cartilage of the larynx forms a complete, signet-ring-
shaped circle providing structural support immediately
below the vocal cords?
A. Thyroid cartilage
B. Cricoid cartilage
C. Arytenoid cartilage
D. Epiglottic cartilage
Correct Answer: B
Rationale: The cricoid cartilage is the only complete
cartilaginous ring in the airway, making cricoid pressure a
historical technique used to compress the esophagus and
prevent regurgitation.
The primary driving force for passive exhalation during
normal quiet breathing is:
A. Contraction of abdominal wall muscles
