Question 1

Which of the following best describes the function of the nasal conchae during inhalation?

Accepted Answer

They filter, heat, and moisten incoming air by increasing mucosal surface area and enhancing air turbulence.

Question 2

A patient with chronic sinusitis is experiencing frequent headaches. Which physiological process best explains this symptom?

Accepted Answer

Absorption of air from blocked sinuses creates a vacuum, resulting in sinus headache.

Question 3

Which structure is responsible for closing off the nasopharynx during swallowing to prevent food from entering the nasal cavity?

Accepted Answer

Soft palate and uvula

Question 4

During a severe asthma attack, which anatomical change in the bronchioles most directly increases airway resistance?

Accepted Answer

Increased smooth muscle contraction

Question 5

Which of the following is a correct sequence of the four processes of respiration, as shown in the diagram?

Accepted Answer

Pulmonary ventilation → External respiration → Transport of respiratory gases → Internal respiration

Question 6

A patient is unable to produce sound but can still breathe normally. Which structure is most likely affected?

Accepted Answer

Vocal folds (true vocal cords)

Question 7

Which of the following best explains why the right main bronchus is more likely to be the site of aspirated objects?

Accepted Answer

It is wider, shorter, and more vertical than the left.

Question 8

Which of the following equations best represents the relationship between pressure, volume, and airflow during pulmonary ventilation?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 9

A person with a tracheal obstruction is unable to breathe. Which emergency procedure uses air in the victim’s lungs to expel the obstruction?

Accepted Answer

Heimlich maneuver

Question 10

Which of the following cell types in the alveoli is responsible for producing surfactant to reduce surface tension?

Accepted Answer

Type II alveolar cells

Question 11

A patient with left-sided heart failure develops pleural effusion. Which fluid is most likely to accumulate in the pleural cavity in this scenario?

Accepted Answer

Watery blood filtrate from lung capillaries

Question 12

Which of the following best describes the function of the pleural fluid?

Accepted Answer

It lubricates the pleural surfaces and creates surface tension to assist lung expansion and recoil.

Question 13

Which of the following changes occurs as airways branch from bronchi to bronchioles?

Accepted Answer

Epithelium changes from pseudostratified columnar to cuboidal, and smooth muscle increases.

Question 14

Which of the following is a function of the paranasal sinuses?

Accepted Answer

They lighten the skull and help warm and moisten incoming air.

Question 15

A patient presents with hoarseness and difficulty speaking above a whisper. Which condition is most likely responsible?

Accepted Answer

Laryngitis causing inflammation and swelling of the vocal folds

Question 16

Which of the following best explains why a person who has recently quit smoking experiences a decrease in 'smoker’s cough' after a few weeks?

Accepted Answer

Ciliary function in the trachea recovers, allowing mucus to be cleared more effectively.

Question 17

Which of the following best describes the role of the respiratory membrane in the alveoli?

Accepted Answer

It is a thin barrier that allows gas exchange by simple diffusion between alveolar air and blood.

Question 18

Which of the following best describes the effect of parasympathetic stimulation on the bronchioles?

Accepted Answer

It causes bronchoconstriction, decreasing airflow.

Question 19

Which of the following is a direct function of the larynx?

Accepted Answer

Voice production

Question 20

A patient with a severe chest infection develops pleurisy. Which of the following best explains the pain experienced during breathing?

Accepted Answer

The pleurae become rough, causing friction and stabbing pain with each breath.

The Respiratory System: Functional Anatomy and Physiology

Study Guide - Practice Questions