NCCAA CERTIFICATION EXAM LATEST UPDATED
VERSION QUESTIONS AND CORRECT ANSWERS.
Question 1: Which gas law explains why the volume of a gas in a closed container
decreases when the pressure is increased during cylinder filling?
A) Charles' law
B) Boyle's law
C) Dalton's law
D) Henry's law
Correct Answer: B
Rationale: Boyle's law states that at constant temperature, pressure and volume
are inversely proportional (P₁V₁ = P₂V₂). When pressure increases during cylinder
filling, volume decreases proportionally. Charles' law describes volume-
temperature relationships, Dalton's law addresses partial pressures, and Henry's
law deals with gas solubility in liquids.
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Question 2: In the anesthesia machine, the low-pressure system includes which
component?
,A) Flowmeter valves
B) Cylinder pressure gauge
C) Vaporizer mounting devices
D) Check valve
Correct Answer: C
Rationale: The low-pressure system comprises vaporizers, gas sampling ports, and
the common gas outlet. Vaporizers are low-pressure devices. Flowmeter valves
and cylinder pressure gauges are part of the high- or intermediate-pressure
systems, and check valves are located in the high-pressure system.
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Question 3: A patient's arterial blood gas shows pH 7.30, PaCO₂ 55 mmHg, HCO₃⁻
30 mEq/L. The primary disorder is:
A) Metabolic acidosis with respiratory compensation
B) Respiratory acidosis with metabolic compensation
C) Metabolic alkalosis with respiratory compensation
D) Respiratory alkalosis with metabolic compensation
Correct Answer: B
Rationale: The low pH (7.30) indicates acidosis. The elevated PaCO₂ (55 mmHg)
indicates a respiratory component. The elevated HCO₃⁻ (30 mEq/L) represents
,metabolic compensation. This pattern is consistent with primary respiratory
acidosis with metabolic compensation.
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Question 4: What is the major motor nerve for the intrinsic muscles of the larynx?
A) Vagus nerve
B) Superior laryngeal nerve
C) Recurrent laryngeal nerve
D) Glossopharyngeal nerve
Correct Answer: C
Rationale: The recurrent laryngeal nerve, a branch of the vagus nerve, provides
motor innervation to all intrinsic muscles of the larynx except the cricothyroid.
The superior laryngeal nerve provides sensory innervation to the larynx above the
vocal cords and motor innervation to the cricothyroid muscle.
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Question 5: Which sensory nerve is stimulated to produce laryngospasm, and
which muscles are responsible?
A) External branch of superior laryngeal nerve; posterior cricoarytenoids
B) Internal branch of superior laryngeal nerve; lateral cricoarytenoids
C) Recurrent laryngeal nerve; thyroarytenoids
, D) Glossopharyngeal nerve; vocalis muscles
Correct Answer: B
Rationale: The internal branch of the superior laryngeal nerve provides sensory
innervation to the supraglottic larynx. Stimulation of this nerve triggers
laryngospasm, which is primarily mediated by the lateral cricoarytenoid muscles
(adductors of the vocal cords).
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Question 6: Gas exchange within the tracheobronchial tree begins at what
generations?
A) 5-7
B) 10-12
C) 17-19
D) 22-24
Correct Answer: C
Rationale: Gas exchange begins at the respiratory bronchioles, which correspond
to generations 17-19 of the tracheobronchial tree. Prior generations (0-16) are
conducting airways with no gas exchange function. Alveoli begin to appear at
these generations.
---
VERSION QUESTIONS AND CORRECT ANSWERS.
Question 1: Which gas law explains why the volume of a gas in a closed container
decreases when the pressure is increased during cylinder filling?
A) Charles' law
B) Boyle's law
C) Dalton's law
D) Henry's law
Correct Answer: B
Rationale: Boyle's law states that at constant temperature, pressure and volume
are inversely proportional (P₁V₁ = P₂V₂). When pressure increases during cylinder
filling, volume decreases proportionally. Charles' law describes volume-
temperature relationships, Dalton's law addresses partial pressures, and Henry's
law deals with gas solubility in liquids.
---
Question 2: In the anesthesia machine, the low-pressure system includes which
component?
,A) Flowmeter valves
B) Cylinder pressure gauge
C) Vaporizer mounting devices
D) Check valve
Correct Answer: C
Rationale: The low-pressure system comprises vaporizers, gas sampling ports, and
the common gas outlet. Vaporizers are low-pressure devices. Flowmeter valves
and cylinder pressure gauges are part of the high- or intermediate-pressure
systems, and check valves are located in the high-pressure system.
---
Question 3: A patient's arterial blood gas shows pH 7.30, PaCO₂ 55 mmHg, HCO₃⁻
30 mEq/L. The primary disorder is:
A) Metabolic acidosis with respiratory compensation
B) Respiratory acidosis with metabolic compensation
C) Metabolic alkalosis with respiratory compensation
D) Respiratory alkalosis with metabolic compensation
Correct Answer: B
Rationale: The low pH (7.30) indicates acidosis. The elevated PaCO₂ (55 mmHg)
indicates a respiratory component. The elevated HCO₃⁻ (30 mEq/L) represents
,metabolic compensation. This pattern is consistent with primary respiratory
acidosis with metabolic compensation.
---
Question 4: What is the major motor nerve for the intrinsic muscles of the larynx?
A) Vagus nerve
B) Superior laryngeal nerve
C) Recurrent laryngeal nerve
D) Glossopharyngeal nerve
Correct Answer: C
Rationale: The recurrent laryngeal nerve, a branch of the vagus nerve, provides
motor innervation to all intrinsic muscles of the larynx except the cricothyroid.
The superior laryngeal nerve provides sensory innervation to the larynx above the
vocal cords and motor innervation to the cricothyroid muscle.
---
Question 5: Which sensory nerve is stimulated to produce laryngospasm, and
which muscles are responsible?
A) External branch of superior laryngeal nerve; posterior cricoarytenoids
B) Internal branch of superior laryngeal nerve; lateral cricoarytenoids
C) Recurrent laryngeal nerve; thyroarytenoids
, D) Glossopharyngeal nerve; vocalis muscles
Correct Answer: B
Rationale: The internal branch of the superior laryngeal nerve provides sensory
innervation to the supraglottic larynx. Stimulation of this nerve triggers
laryngospasm, which is primarily mediated by the lateral cricoarytenoid muscles
(adductors of the vocal cords).
---
Question 6: Gas exchange within the tracheobronchial tree begins at what
generations?
A) 5-7
B) 10-12
C) 17-19
D) 22-24
Correct Answer: C
Rationale: Gas exchange begins at the respiratory bronchioles, which correspond
to generations 17-19 of the tracheobronchial tree. Prior generations (0-16) are
conducting airways with no gas exchange function. Alveoli begin to appear at
these generations.
---
