Question 1

Which of the following structures is NOT part of the upper respiratory system?

Accepted Answer

Trachea

Question 2

What is the primary function of the alveoli in the lungs?

Accepted Answer

Gas exchange between air and blood

Question 3

Which cell type in the alveoli is responsible for producing surfactant?

Accepted Answer

Type II alveolar cell

Question 4

A patient with cystic fibrosis has thick, sticky mucus in the airways. This is primarily due to a defect in which protein?

Accepted Answer

Cystic Fibrosis Transmembrane conductance Regulator (CFTR)

Question 5

Which of the following best describes the conducting zone of the respiratory tract?

Accepted Answer

It contains cartilaginous rings and does not participate in gas exchange.

Question 6

Trace the path of an oxygen molecule from the nasal cavity to a red blood cell in the pulmonary capillary. Which sequence is correct?

Accepted Answer

Nasal cavity → Trachea → Primary bronchi → Terminal bronchioles → Alveoli → Capillary

Question 7

Which of the following is a function of the pleural fluid in the thoracic cavity?

Accepted Answer

It reduces friction and allows smooth movement of the lungs during breathing.

Question 8

What is the main difference between the conducting zone and the respiratory zone of the respiratory tract?

Accepted Answer

The conducting zone contains cartilage, while the respiratory zone is collapsible and allows gas exchange.

Question 9

A patient inhales cigarette smoke, which paralyzes the cilia in their airway. What is the most immediate consequence?

Accepted Answer

Impaired mucociliary clearance leading to accumulation of mucus and pathogens

Question 10

Which equation best represents the relationship between surface area, diffusion distance, and rate of gas exchange in the alveoli?

Accepted Answer

$$Rate\ of\ Gas\ Exchange \propto \frac{Surface\ Area}{Diffusion\ Distance}$$

Question 11

Which anatomical structure marks the transition from the conducting zone to the respiratory zone?

Accepted Answer

Terminal bronchiole

Question 12

Which of the following is NOT a function of the epithelial cells lining the airways?

Accepted Answer

Producing surfactant for gas exchange

Question 13

Pulmonary circulation is characterized by which of the following?

Accepted Answer

Low resistance, high flow

Question 14

Which of the following best explains why cystic fibrosis patients are prone to respiratory infections?

Accepted Answer

Thick mucus impairs mucociliary clearance, allowing bacteria to accumulate.

Question 15

Which of the following is TRUE regarding the lobes of the lungs?

Accepted Answer

The right lung has three lobes and the left lung has two lobes.

Question 16

Which cell type in the alveoli is primarily responsible for phagocytosis of pathogens and debris?

Accepted Answer

Macrophage

Question 17

A genetic defect in chloride transport in airway epithelial cells leads to which disease?

Accepted Answer

Cystic fibrosis

Question 18

Which of the following best describes the role of elastic fibers in the alveoli?

Accepted Answer

They provide structural support and allow the alveoli to recoil during exhalation.

Question 19

Which of the following is the correct order of the respiratory portion of the respiratory tract?

Accepted Answer

Respiratory bronchioles → Alveolar ducts → Alveoli

Question 20

Which of the following mechanisms is most important for clearing inhaled particles from the conducting zone of the airway?

Accepted Answer

Mucociliary clearance

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

Study Guide - Practice Questions