Question 1

Which of the following best describes the process of external respiration?

Accepted Answer

The exchange of gases between lung air and blood via diffusion.

Question 2

During inspiration, which of the following pressure relationships is correct?

Accepted Answer

P$$_{alv}$$ \u003c P$$_{atm}$$

Question 3

What is the functional significance of the anatomical dead space in the conducting zone?

Accepted Answer

It prevents all inspired air from reaching the alveoli for gas exchange.

Question 4

Which equation correctly represents minute ventilation ($$V_E$$)?

Accepted Answer

$$V_E = V_T 	imes RR$$

Question 5

A patient with restrictive pulmonary disease will most likely exhibit which of the following changes in lung volumes?

Accepted Answer

Decreased total lung capacity (TLC)

Question 6

Which of the following factors would increase airway resistance?

Accepted Answer

Bronchoconstriction due to histamine release

Question 7

According to LaPlace’s Law, what happens to the pressure required to prevent alveolar collapse as the radius of the alveolus decreases?

Accepted Answer

Pressure increases

Question 8

Which of the following is a primary function of pulmonary surfactant?

Accepted Answer

Decreasing muscular work required for breathing

Question 9

If a person’s tidal volume is 500 mL and respiratory rate is 12 breaths/min, what is their minute ventilation?

Accepted Answer

6,000 mL/min

Question 10

Which of the following best explains why gas exchange in the pulmonary system is rapid?

Accepted Answer

The respiratory membrane is thin and has a huge surface area.

Question 11

What is the effect of pneumothorax on intrapleural pressure?

Accepted Answer

P$$_{ip}$$ equilibrates with atmospheric pressure

Question 12

Which formula correctly represents lung compliance?

Accepted Answer

$$C = \frac{\Delta V}{\Delta (P_{alv} - P_{ip})}$$

Question 13

During exercise, which change is most efficient for increasing alveolar ventilation ($$V_A$$)?

Accepted Answer

Increasing tidal volume ($$V_T)$$

Question 14

Which of the following is NOT a function of the respiratory system?

Accepted Answer

Production of red blood cells

Question 15

Which of the following would most likely be observed in a patient with obstructive pulmonary disease?

Accepted Answer

Increased functional residual capacity (FRC)

Question 16

What is the primary mechanism by which carbon dioxide affects airway diameter?

Accepted Answer

High CO$$_2$$ causes bronchodilation

Question 17

Which of the following structures is part of the respiratory zone?

Accepted Answer

Respiratory bronchioles

Question 18

Which of the following is true regarding the pleura?

Accepted Answer

It contains serous fluid for lubrication.

Question 19

Which of the following best describes the relationship between transpulmonary pressure and lung volume?

Accepted Answer

As transpulmonary pressure increases, lung volume increases.

Question 20

Which of the following is the correct formula for alveolar ventilation ($$V_A$$)?

Accepted Answer

$$V_A = (V_T - DSV) 	imes RR$$

Chapter 16: Pulmonary Ventilation – Structure, Function, and Clinical Relevance

Study Guide - Practice Questions