Mechanics of Breathing Practice Questions

Question 1

A newborn presented with chest retractions, dyspnea, and lethargy. The pediatrician diagnosed the baby with respiratory distress syndrome. This occurs due to the deficiency of:

Accepted Answer

Lecithin

Answer

Dipalmitoyl inositol

Answer

Dipalmitoylphosphatidylethanolamine

Answer

Sphingomyelin

Question 2

Which of the following statements about lung compliance is false?

Accepted Answer

Decreased in emphysema

Answer

Total compliance is 0.2 L/cm H2O

Answer

A measure of lung distensibility

Answer

Change in volume per unit change in pressure

Question 3

Which of the following is most associated with respiratory alkalosis?

Accepted Answer

Assisted control mode ventilation

Answer

SIMV

Answer

Non invasive ventilation

Answer

Pressure controlled

Question 4

Which of the following statements about breathing is incorrect?

Accepted Answer

Normal breathing occurs when transpulmonary pressure is 5-8 cm H2O

Answer

Inspiration is an active process

Answer

Expiration during quiet breathing is passive

Answer

Compliance is influenced by multiple factors including surfactant.

Question 5

Damage to pneumotaxic center along with vagus nerve causes which type of respiration?

Accepted Answer

Apneustic breathing

Answer

Cheyne-Stokes breathing

Answer

Deep and slow breathing

Answer

Shallow and rapid breathing

Question 6

Which of the following has prolonged inspiratory spasms that resemble breath holding?

Accepted Answer

Apneustic breathing

Answer

Kussmaul breathing

Answer

Biot breathing

Answer

Cheyne-Stokes breathing

Question 7

Hysteresis is observed between the deflation and inflation curves in an isolated lung compliance diagram. What is the best description for the same?

Accepted Answer

Variation in surface tension forces at air- liquid interface

Answer

Stretching of elastic elements of lung parenchyma

Answer

Decrease in surface tension in air-water interface at higher lung volumes

Answer

Hering Breuer reflex is operational at higher lung volumes

Question 8

Hyaline membrane disease of the lungs is characterized by –

Accepted Answer

FRC is reduced compared to closing volume

Answer

FRC is increased compared to closing volume

Answer

FRC is equal to closing volume

Answer

FRC is not related to closing volume

Question 9

Which of the following areas of nitrogen washout test indicate closing volume?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 10

Calculate the FEV1/FVC ratio from the spirometry reading shown below.

Accepted Answer

80-89 %

Answer

60-69 %

Answer

70-79 %

Answer

90-99 %

Mechanics of Breathing — MCQs

Mechanics of Breathing — MCQs

Want unlimited practice?