Question 1

Which of the following best describes the relationship between pressure and volume in the lungs according to Boyle's Law?

Accepted Answer

As the volume of the lungs increases, the pressure inside the lungs decreases.

Question 2

A patient with a punctured chest wall develops a pneumothorax. Which pressure relationship is disrupted, leading to lung collapse?

Accepted Answer

Intrapleural pressure equals atmospheric pressure.

Question 3

Which equation correctly represents the relationship between gas flow, pressure, and resistance in the airways?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 4

During quiet inspiration, which muscles contract to increase thoracic volume?

Accepted Answer

Diaphragm and external intercostals

Question 5

Which of the following best explains why surfactant is critical for normal lung function?

Accepted Answer

It reduces the surface tension of alveolar fluid, discouraging alveolar collapse.

Question 6

A patient with pulmonary fibrosis has reduced lung compliance. Which of the following is most likely to be observed in this patient?

Accepted Answer

Greater energy expenditure just to breathe

Question 7

Which of the following statements about intrapleural pressure ($$P_{ip}) is $$correct?

Accepted Answer

$$P_{ip}$$ fluctuates with breathing but is always negative relative to $$P_{atm}$$ and $$P_{pul}.$$

Question 8

Which of the following would most likely increase airway resistance and make breathing more difficult?

Accepted Answer

Constriction or obstruction of bronchioles during an asthma attack

Question 9

If the transpulmonary pressure ($$P_{pul} - P_{ip}) $$increases, what is the effect on the lungs?

Accepted Answer

The lungs expand more.

Question 10

Which of the following best describes the process of expiration during quiet breathing?

Accepted Answer

It is a passive process resulting from relaxation of inspiratory muscles and elastic recoil of the lungs.

Question 11

A premature infant is experiencing repeated alveolar collapse after each breath. What is the most likely physiological cause?

Accepted Answer

Insufficient quantity of surfactant

Question 12

Which of the following pulmonary function test results would you expect in a patient with obstructive pulmonary disease such as chronic bronchitis?

Accepted Answer

Increased residual volume (RV)

Question 13

During forced expiration, which muscles are primarily responsible for decreasing thoracic volume?

Accepted Answer

Abdominal (oblique and transverse) and internal intercostal muscles

Question 14

Which of the following best defines atelectasis?

Accepted Answer

Collapse of lung tissue due to plugged bronchioles or air in the pleural cavity

Question 15

A patient is unable to expel 80% of their forced vital capacity (FVC) in the first second of a forced expiratory volume (FEV1) test. What does this most likely indicate?

Accepted Answer

Obstructive pulmonary disease

Question 16

Which of the following would decrease total respiratory compliance?

Accepted Answer

Ossification of costal cartilage

Question 17

Which law explains why gases move from areas of higher pressure to areas of lower pressure during breathing?

Accepted Answer

Boyle's Law

Question 18

Which of the following is a direct result of increased alveolar surface tension?

Accepted Answer

Increased risk of alveolar collapse

Question 19

If intrapleural pressure ($$P_{ip}) $$becomes equal to intrapulmonary pressure ($$P_{pul}$$), what is the most likely outcome?

Accepted Answer

The lungs will collapse.

Question 20

Which of the following best describes the effect of epinephrine on the airways during an acute asthma attack?

Accepted Answer

It dilates the bronchioles, reducing airway resistance.

The Respiratory System: Mechanics, Pressures, and Pulmonary Function

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