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 alveolus 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 is supported by cartilaginous rings and does not participate in gas exchange

Question 6

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

Accepted Answer

Nasal cavity → Trachea → Primary bronchi → Terminal bronchiole → Alveolus → Capillary

Question 7

Which equation best represents the relationship between the rate of gas diffusion ($$D$$), surface area ($$A$$), and distance ($$d) in $$the alveoli?

Accepted Answer

$$D = \frac{A}{d}$$

Question 8

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

Accepted Answer

It provides lubrication and allows the lungs to move smoothly during breathing

Question 9

A patient presents with impaired mucociliary clearance. Which of the following is most likely to occur as a result?

Accepted Answer

Accumulation of pathogens and particles in the airways

Question 10

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

Accepted Answer

Terminal bronchiole

Question 11

Which of the following statements about pulmonary circulation is correct?

Accepted Answer

It is a low resistance, high flow system

Question 12

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

Accepted Answer

Macrophage

Question 13

What is the main role of elastic fibers surrounding the alveoli?

Accepted Answer

To provide structural support and aid in lung recoil during exhalation

Question 14

Which of the following best describes the mucociliary clearance mechanism?

Accepted Answer

It is the movement of mucus and trapped particles out of the airways by cilia

Question 15

Which of the following is a consequence of cigarette smoking on the respiratory epithelium?

Accepted Answer

Paralysis of cilia, leading to impaired mucociliary clearance

Question 16

Which of the following is the correct order of the subdivisions of the air conduction portion of the respiratory tract?

Accepted Answer

Nasal cavity → Nasopharynx → Larynx → Trachea → Primary bronchi → Secondary bronchi → Tertiary bronchi → Bronchioles → Terminal bronchioles

Question 17

Which of the following is NOT a function of the airway epithelium?

Accepted Answer

Gas exchange

Question 18

A genetic defect in chloride transport in the airway epithelium leads to which disease?

Accepted Answer

Cystic fibrosis

Question 19

Which of the following best explains why the alveoli are highly efficient at gas exchange?

Accepted Answer

They possess a large surface area and a short diffusion distance

Question 20

Which of the following is true regarding the pleural membranes?

Accepted Answer

The pleural fluid between the membranes reduces friction during breathing

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

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