Respiratory Physiology Practice Questions

12 Questions | By Chachelly | Last updated: Mar 22, 2022 | Total Attempts: 1080

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Respiratory Physiology Practice Questions - Quiz

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1.

A patient was evaluated in a pulmonary function laboratory. At residual volume, a 2.5 l bag was attached to the patient’s mouthpiece. The bag contained 0.8% He. The patient breathed into and out of the bag for 2 minutes, after which the He concentration in the bag was measured and found to be 0.55%. The patient’s residual volume was:
- A.
  
  0.9 l
- B.
  
  1.08 l
- C.
  
  1.14 l
- D.
  
  1.22 l
2.

A woman was evaluated in a whole body plethysmograph on a day when the barometric pressure was 752 mmHg. At residual volume, she inspired against a closed mouthpiece and airway pressure fell to 724 mmHg. During this inspiratory maneuver, 120 ml of air was expelled from the phethysmograph. Her residual volume was:
- A.
  
  2.1 l
- B.
  
  2.8 l
- C.
  
  3.1 l
- D.
  
  3.8 l
3.

An elderly man tripped and fell down a flight of steps, breaking a rib which caused a pneumothorax. If you were to measure the circumference of this man’s chest, you would expect it to be:
- A.
  
  Larger than normal
- B.
  
  Normal
- C.
  
  Smaller than normal.
- D.
  
  Cannot predict without additional information.
4.

A coal miner went to his local clinic for chronic shortness of breath. His arterial oxygen saturation was 76% (below normal) and his esophageal pressure, an estimate of intrapleural pressure, was normal. In addition, his FEV1/FRC was 0.8. His residual volume was probably:
- A.
  
  Below normal
- B.
  
  Normal
- C.
  
  Above normal
5.

A premature baby with difficulty breathing probably has:
- A.
  
  An increased FRC.
- B.
  
  An increased TLC
- C.
  
  A decreased RV
- D.
  
  A and C.
6.

Chest X-rays of patients with emphysema show an elongated mediastinum. This is the result of:
- A.
  
  Elastase breaking down the covering of the mediastinum.
- B.
  
  Descent of the floor of the diaphragm
- C.
  
  Cardiac failure
7.

Contraction of the abdominal muscles is important in
- A.
  
  Normal (quiet) inspiration.
- B.
  
  Forced (maximum) inspiration
- C.
  
  Normal (quiet) expiration.
- D.
  
  Forced (maximum) expiration.
- E.
  
  None of the above.
8.

Alveolar surfactant acts to increase pulmonary
- A.
  
  Surface tension.
- B.
  
  Compliance.
- C.
  
  Airway resistance.
9.

In emphysema, which of the following would be expected to be below normal (less positive or more negative than normal)?
- A.
  
  Airway resistance
- B.
  
  Lung compliance
- C.
  
  Intrapleural pressure
- D.
  
  FEV1
- E.
  
  B, C, and D above
10.

Residual volume of 2.5 liters is:
- A.
  
  Above normal
- B.
  
  Below normal
- C.
  
  Within the normal range
11.

Respiratory Ventilation Predicted Measured Measure after bronchodilator Vital Capacity 3.3 L 2.3 L 2.4 L Residual Volume 0.8 L 0.6 L 0.6 L Total Lung Capacity 4.1 L 2.9 L 3.0 L FEV-1 2.6 L 1.9 L 2.0 L FEV-1 / FVC > 80% 83% 83% The following measurements were taken on a 23 year old female with a recent history of dyspnea and cyanosis on exertion. This patient has:
- A.
  
  A restrictive disease
- B.
  
  An obstructive disease.
- C.
  
  A combined obstructive/restrictive disease
12.

Spirometry can be used to measure:
- A.
  
  FRC.
- B.
  
  RV
- C.
  
  TLC
- D.
  
  FVC