Question 1

Which structure is primarily responsible for preventing food from entering the lower respiratory tract during swallowing?

Accepted Answer

Epiglottis

Question 2

A patient with progressive neuromuscular disease presents with shallow, weak breaths and drowsiness when lying flat. Which muscles are most likely affected, and what is the likely consequence if left untreated?

Accepted Answer

Diaphragm and intercostal muscles; respiratory failure

Question 3

During inspiration, which of the following changes occurs in the thoracic cavity?

Accepted Answer

Thoracic volume increases and intrapulmonary pressure decreases

Question 4

A child at a restaurant suddenly has a silent, ineffective cough and clutches their throat. What anatomic area is most likely obstructed, and what is the recommended immediate action?

Accepted Answer

Larynx; perform the Heimlich maneuver

Question 5

Which tissue type lines the trachea and is responsible for trapping and moving particles out of the airway?

Accepted Answer

Pseudostratified ciliated columnar epithelium

Question 6

Which of the following best describes the function of alveolar pores?

Accepted Answer

They allow air pressure to equalize between adjacent alveoli

Question 7

A 62-year-old with emphysema exhibits increased breathlessness, decreased breath sounds, and hyperresonance over the right chest. What is the most probable diagnosis and underlying problem?

Accepted Answer

Pneumothorax; collapsed lung due to air in pleural cavity

Question 8

Which equation correctly represents the relationship between pressure, volume, and airflow in the lungs during breathing?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 9

Which structure is the first to filter, warm, and humidify inspired air?

Accepted Answer

Nasal cavity

Question 10

Which of the following is the correct sequence of structures that air passes through from the external environment to the alveoli?

Accepted Answer

Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

Question 11

Which part of the bronchial tree is responsible for the greatest resistance to airflow in healthy lungs?

Accepted Answer

Medium-sized bronchi

Question 12

What is the main function of the pleural cavity?

Accepted Answer

To reduce friction between lung and thoracic wall during breathing

Question 13

Which structure forms the 'Adam's apple' and is most prominent in males?

Accepted Answer

Thyroid cartilage

Question 14

Which of the following best explains why the right lung has three lobes while the left lung has only two?

Accepted Answer

The left lung is smaller due to the position of the heart

Question 15

Which of the following is a critical function of the cilia lining the trachea?

Accepted Answer

Moving trapped particles upward toward the pharynx

Question 16

Which structure is most critical for gas exchange in the lungs?

Accepted Answer

Alveoli

Question 17

A 74-year-old who recently had a stroke swallows soup and suddenly coughs violently, turns red, and cannot speak. Which structure failed its protective function, and what is the immediate risk?

Accepted Answer

Epiglottis; aspiration and airway obstruction

Question 18

Which of the following best describes the role of surfactant in the alveoli?

Accepted Answer

It decreases surface tension to prevent alveolar collapse

Question 19

Which equation best describes the partial pressure of oxygen in alveolar air?

Accepted Answer

$$P_{O_2$} = F_{O_2$} 	imes (P_{atm} - P_{H_2O})$$

Anatomy and Physiology of the Respiratory System: Structure, Function, and Clinical Relevance

Study Guide - Practice Questions

Study Guide - Flashcards