Question 1

A patient inhales a small plastic bead, which becomes lodged in one of the primary bronchi. Based on the anatomical structure of the bronchial tree, in which lung is the bead most likely to be found, and why?

Accepted Answer

Right lung, because the right primary bronchus is more vertical and wider.

Question 2

Which of the following best describes the function of Type II alveolar cells (Type II pneumocytes) in the lungs?

Accepted Answer

They secrete surfactant to reduce surface tension in the alveoli.

Question 3

A premature infant is experiencing respiratory distress due to insufficient surfactant production. Which cell type is most likely underdeveloped in this infant?

Accepted Answer

Type II alveolar cells

Question 4

During a forceful exhalation, why do the lungs not completely empty of air?

Accepted Answer

Because some air remains in the relatively rigid cartilaginous airways and alveoli, contributing to residual volume.

Question 5

A patient with chronic bronchitis has impaired ciliary function in the trachea. What is the most likely consequence of this impairment?

Accepted Answer

Reduced ability to clear debris and pathogens, leading to increased coughing and infection risk.

Question 6

Which of the following best explains why the alveolar walls are composed of simple squamous epithelium?

Accepted Answer

To minimize diffusion distance and maximize the rate of gas exchange.

Question 7

A person with a pulmonary embolus has a blockage in a pulmonary artery. How does this affect gas exchange in the affected lung region?

Accepted Answer

It reduces perfusion, limiting gas exchange even if ventilation is normal.

Question 8

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

Accepted Answer

Airflow $$= \frac{\Delta P}{R}$$, where $$\Delta P is $$the pressure difference and $$R is $$resistance.

Question 9

A patient with asthma experiences bronchoconstriction. Which airway structure is primarily responsible for this change in airway diameter?

Accepted Answer

Smooth muscle in the bronchioles

Question 10

Which of the following best describes the function of pleural fluid in the thoracic cavity?

Accepted Answer

It reduces friction, allowing the lungs to slide smoothly against the chest wall during breathing.

Question 11

A person is breathing quietly at rest. Which muscle is primarily responsible for increasing thoracic volume during inhalation?

Accepted Answer

Diaphragm

Question 12

Which of the following statements about the conducting zone of the respiratory system is correct?

Accepted Answer

It humidifies, filters, and warms incoming air but does not significantly participate in gas exchange.

Question 13

A patient with a collapsed lung (atelectasis) due to airway obstruction is at risk for which of the following complications if the obstruction is not removed?

Accepted Answer

Tissue necrosis and inflammation in the affected lung region

Question 14

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

Accepted Answer

The right lung is larger and has three lobes, while the left lung is smaller with two lobes to accommodate the heart.

Question 15

Which tissue type lines most of the conducting airways, such as the trachea and bronchi?

Accepted Answer

Ciliated pseudostratified columnar epithelium

Question 16

A person with low lung compliance would most likely experience which of the following symptoms?

Accepted Answer

Difficulty inhaling due to stiff lungs that resist expansion

Question 17

Which of the following best describes the role of alveolar macrophages?

Accepted Answer

They phagocytose debris, dead cells, and pathogens in the alveoli.

Question 18

During swallowing, which structure elevates to prevent food and liquids from entering the nasal cavity?

Accepted Answer

Uvula

Question 19

Which of the following best explains why the V/Q (ventilation/perfusion) ratio is important in respiratory physiology?

Accepted Answer

It reflects the matching of airflow and blood flow necessary for effective gas exchange.

Question 20

A histological section of lung tissue shows a single layer of flat cells lining the alveoli. Which cell type is most likely being observed?

Accepted Answer

Type I alveolar cells (simple squamous epithelium)

Respiratory System: Structure, Function, and Histology

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