Primary FRCA Physiology: Respiratory Exam | Most
Recent Exam 2026 Actual Complete Real Exam 300
Questions And Correct Answers (Verified Answers)
Already Graded A+ |Guaranteed Success!! Newest
Exam | Just Released!! DR.LASITH RANASINGHE
Explore the physiology of respiration, including gas exchange, lung
mechanics, ventilation, and oxygen transport. (303 )
1
Q
What type of epithelium is the nasal epithelium?
ANSWERS:
Pseudostratified ciliated columnar epithelium containing numerous
mucous and serous glands.
2
Q
What is the normal vital capacity per kilogram?
ANSWERS:
60 mL/kg
3
Q
List some techniques for measuring lung volumes.
ANSWERS:
, Water-sealed spirometer
Dry spirometer
Body plethysmograph
Helium dilution
Nitrogen washout
4
Q
Describe the helium dilution method for measuring lung volumes.
ANSWERS:
Helium has a low solubility so is hardly absorbed into the blood.
Subject breathes in a known concentration of helium in a closed
system with a spirometer and wait for it to equilibrate.
Then measure the expired concentration of helium to determine
the total lung volume.
5
Q
What is the normal FRC in most normal subjects?
ANSWERS:
2500 mL
6
Q
How long does the oxygen reservoir last when breathing air vs being
preoxygenated?
ANSWERS:
, Oxygen consumption: 250 mL/min
Breathing air : 375 mL of oxygen = 1.5 mins
Breathing oxygen : 2250 mL of oxygen = 9 mins
7
Q
Describe the relationship between FRC and pulmonary vascular
resistance.
ANSWERS:
PVR is lowest at FRC.
At low lung volumes, large pulmonary vessel walls are less
supported by traction from surrounding tissues and experience
hypoxic vasoconstriction.
At high lung volumes, capillaries are compressed by
hyperexpanded alveoli.
8
Q
Define:
dead space
ANSWERS:
Volume of inspired air that does not take part in gas exchange.
9
Q
What are alveolar time constants?
, ANSWERS:
The time it takes for an alveolus to fill or empty with gas. It is
determined by the resistance to airflow in the airways and
the compliance of the alveoli
10
Q
Describe the graph produced by Fowler’s method.
ANSWERS:
1. Anatomical dead space
2. Mixed alveolar and dead space gas
3. Alveolar air
4. Closing capacity
Recent Exam 2026 Actual Complete Real Exam 300
Questions And Correct Answers (Verified Answers)
Already Graded A+ |Guaranteed Success!! Newest
Exam | Just Released!! DR.LASITH RANASINGHE
Explore the physiology of respiration, including gas exchange, lung
mechanics, ventilation, and oxygen transport. (303 )
1
Q
What type of epithelium is the nasal epithelium?
ANSWERS:
Pseudostratified ciliated columnar epithelium containing numerous
mucous and serous glands.
2
Q
What is the normal vital capacity per kilogram?
ANSWERS:
60 mL/kg
3
Q
List some techniques for measuring lung volumes.
ANSWERS:
, Water-sealed spirometer
Dry spirometer
Body plethysmograph
Helium dilution
Nitrogen washout
4
Q
Describe the helium dilution method for measuring lung volumes.
ANSWERS:
Helium has a low solubility so is hardly absorbed into the blood.
Subject breathes in a known concentration of helium in a closed
system with a spirometer and wait for it to equilibrate.
Then measure the expired concentration of helium to determine
the total lung volume.
5
Q
What is the normal FRC in most normal subjects?
ANSWERS:
2500 mL
6
Q
How long does the oxygen reservoir last when breathing air vs being
preoxygenated?
ANSWERS:
, Oxygen consumption: 250 mL/min
Breathing air : 375 mL of oxygen = 1.5 mins
Breathing oxygen : 2250 mL of oxygen = 9 mins
7
Q
Describe the relationship between FRC and pulmonary vascular
resistance.
ANSWERS:
PVR is lowest at FRC.
At low lung volumes, large pulmonary vessel walls are less
supported by traction from surrounding tissues and experience
hypoxic vasoconstriction.
At high lung volumes, capillaries are compressed by
hyperexpanded alveoli.
8
Q
Define:
dead space
ANSWERS:
Volume of inspired air that does not take part in gas exchange.
9
Q
What are alveolar time constants?
, ANSWERS:
The time it takes for an alveolus to fill or empty with gas. It is
determined by the resistance to airflow in the airways and
the compliance of the alveoli
10
Q
Describe the graph produced by Fowler’s method.
ANSWERS:
1. Anatomical dead space
2. Mixed alveolar and dead space gas
3. Alveolar air
4. Closing capacity
