Question 1

Which structure in the upper respiratory system is primarily responsible for warming, humidifying, and filtering incoming air?

Accepted Answer

The nasal cavity

Question 2

What is the main function of the epiglottis during swallowing?

Accepted Answer

To close off the larynx and prevent food or liquids from entering the airways

Question 3

Which equation best represents Boyle’s law, which explains the relationship between pressure and volume during pulmonary ventilation?

Accepted Answer

$$ P 	imes V = k $$

Question 4

During forced expiration, which muscles are primarily responsible for increasing intra-abdominal pressure and depressing the rib cage?

Accepted Answer

Abdominal muscles

Question 5

Which of the following is NOT a protective mechanism of the respiratory system?

Accepted Answer

Direct absorption of toxins through alveolar pores

Question 6

What is the anatomical dead space in the respiratory system?

Accepted Answer

The volume of the conducting zone conduits that never contributes to gas exchange

Question 7

Which equation correctly calculates the vital capacity (VC) of the lungs?

Accepted Answer

$$ VC = TV + IRV + ERV $$

Question 8

According to Dalton’s law of partial pressures, what is the total pressure exerted by a mixture of gases?

Accepted Answer

The sum of the pressures exerted by each gas in the mixture

Question 9

Which factor does NOT decrease lung compliance?

Accepted Answer

Increased elasticity of lung tissue

Question 10

What is the primary effect of surfactant produced by type II alveolar cells?

Accepted Answer

It reduces alveolar surface tension

Question 11

Which of the following best describes the Haldane effect?

Accepted Answer

The drop in $$ PO_2$  at $$the tissues allows hemoglobin to carry more $$ CO_2$ $$

Question 12

Which equation represents the carbonic acid–bicarbonate buffer system in the blood?

Accepted Answer

$$ CO_2$ + H_2O \leftrightarrow H_2CO_3 \leftrightarrow H^+ + $$HCO_3$$^- $$

Question 13

Which respiratory disorder is characterized by permanently enlarged alveoli and deterioration of alveolar walls?

Accepted Answer

Obstructive emphysema

Question 14

What is the main physiological adjustment during acclimatization to high altitude?

Accepted Answer

Increase in erythropoietin production

Question 15

Which neural structure is primarily responsible for generating the rhythm of breathing?

Accepted Answer

Ventral respiratory group (VRG) in the medulla oblongata

Question 16

A patient with low vital capacity (VC), total lung capacity (TLC), functional residual capacity (FRC), and residual volume (RV) is most likely suffering from which type of pulmonary disorder?

Accepted Answer

Restrictive pulmonary disorder

Question 17

Which of the following best explains why alveolar air has a higher concentration of $$ CO_2$ $$ and lower concentration of $$ O_2$ $$ compared to atmospheric air?

Accepted Answer

Gas exchange occurs in the lungs, humidification of air, and mixing of alveolar gas with each breath

Question 18

Which of the following is a consequence of carbon monoxide poisoning?

Accepted Answer

CO outcompetes oxygen for hemoglobin binding sites due to its high affinity

Question 19

During vigorous exercise, which term describes the deeper and more vigorous respirations that ensure tissue demands for oxygen are met?

Accepted Answer

Hyperpnea

Question 20

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

Accepted Answer

Initiates the production of surfactant

Chapter 22: The Respiratory System – Functional Anatomy and Physiology

Study Guide - Practice Questions

Study Guide - Flashcards