Question 1

During inspiration, which of the following best describes the relationship between lung volume and intrapulmonary pressure according to Boyle’s law?

Accepted Answer

As lung volume increases, intrapulmonary pressure decreases.

Question 2

A patient with a collapsed lung (pneumothorax) has intrapleural pressure equal to atmospheric pressure. What is the immediate consequence for the lung?

Accepted Answer

The lung collapses because the suction effect is lost.

Question 3

Which equation correctly represents Boyle’s law for pulmonary ventilation?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 4

Which physical factor is most directly affected by the destruction of elastic tissue in the lungs, such as from coal dust exposure?

Accepted Answer

Pulmonary compliance

Question 5

A premature infant is diagnosed with Infant Respiratory Distress Syndrome (RDS). Which treatment is most likely to improve their pulmonary function?

Accepted Answer

Providing artificial surfactant by inhalation

Question 6

During forced expiration, which accessory muscles are primarily responsible for increasing intra-abdominal pressure and pushing the diaphragm superiorly?

Accepted Answer

Abdominal muscles (rectus abdominis, external oblique, internal oblique, transversus abdominis)

Question 7

Which pulmonary volume is defined as the amount of air inspired or expired during normal quiet ventilation?

Accepted Answer

Tidal volume (TV)

Question 8

What is the formula for calculating total lung capacity (TLC)?

Accepted Answer

$$TLC = IRV + TV + ERV + RV$$

Question 9

Which nonrespiratory movement is defined as a slow and deep inspiration held and followed by a slow expiration, and what is its primary function?

Accepted Answer

Sigh; reopens local groups of collapsed alveoli and stimulates surfactant release

Question 10

Which of the following best explains why surfactant is essential for normal pulmonary function?

Accepted Answer

It disrupts hydrogen bonds between water molecules, reducing surface tension and allowing alveoli to remain open.

Question 11

A patient with pulmonary fibrosis has decreased pulmonary compliance. Which of the following best describes the effect on their breathing?

Accepted Answer

It becomes harder to inflate the lungs due to stiffened tissue.

Question 12

Which equation would you use to calculate the functional residual capacity (FRC) of the lungs?

Accepted Answer

$$FRC = ERV + RV$$

Question 13

During inspiration, which muscles contract to increase the size of the thoracic cavity?

Accepted Answer

Diaphragm and external intercostal muscles

Question 14

Which of the following is a real-life application of pulmonary ventilation principles for anxiety control?

Accepted Answer

Synchronizing breathing to regulate pressure gradients and promote relaxation

Question 15

What is the primary effect of bronchodilation on airway resistance during pulmonary ventilation?

Accepted Answer

It decreases airway resistance by widening the lumen.

Question 16

Which pulmonary capacity is measured as the sum of tidal volume, inspiratory reserve volume, and expiratory reserve volume?

Accepted Answer

Vital capacity (VC)

Question 17

A person performs the Heimlich maneuver on someone choking. Which muscle action is most directly involved in this emergency procedure?

Accepted Answer

Forceful contraction of the diaphragm upwards to expel air

Question 18

Which of the following best describes the anatomical dead space in the respiratory system?

Accepted Answer

The volume of air that remains in the conduction zone and does not participate in gas exchange

Question 19

Which accessory muscle group extends the vertebral column to allow greater expansion of the thoracic cage during inspiration?

Accepted Answer

Erector spinae muscle group

Question 20

Which pulmonary volume is calculated by multiplying tidal volume by the number of breaths per minute?

Accepted Answer

Minute respiratory volume

Pulmonary Ventilation: Mechanisms and Physical Factors

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